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111 Work Energy and Power
bull Work is the transforming or
converting of energy It is
measured in joules (J)
bull Energy is the ability to do work
bull Potential energy is stored energy
bull Kinetic energy is energy of
movement
bull The law of
conservation
of energy
states that in
any closed
system the
total amount of
energy
remains
constant
bull Power is the rate at which energy is
transformed or the rate at which
work is done
Assignment
bull P 339 3 5-8
112 Electrical Energy and
Power
bull P=Et
bull E=Pt
bull t=EP
P Power Watt W
E Energy Joule J
t time Second s
Example 1
bull A laser pointer used 0045J in 15s
what is its power
Example 2
bull A 100W light bulb is left on for 3
hours How much electrical energy
was used
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull Work is the transforming or
converting of energy It is
measured in joules (J)
bull Energy is the ability to do work
bull Potential energy is stored energy
bull Kinetic energy is energy of
movement
bull The law of
conservation
of energy
states that in
any closed
system the
total amount of
energy
remains
constant
bull Power is the rate at which energy is
transformed or the rate at which
work is done
Assignment
bull P 339 3 5-8
112 Electrical Energy and
Power
bull P=Et
bull E=Pt
bull t=EP
P Power Watt W
E Energy Joule J
t time Second s
Example 1
bull A laser pointer used 0045J in 15s
what is its power
Example 2
bull A 100W light bulb is left on for 3
hours How much electrical energy
was used
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull Potential energy is stored energy
bull Kinetic energy is energy of
movement
bull The law of
conservation
of energy
states that in
any closed
system the
total amount of
energy
remains
constant
bull Power is the rate at which energy is
transformed or the rate at which
work is done
Assignment
bull P 339 3 5-8
112 Electrical Energy and
Power
bull P=Et
bull E=Pt
bull t=EP
P Power Watt W
E Energy Joule J
t time Second s
Example 1
bull A laser pointer used 0045J in 15s
what is its power
Example 2
bull A 100W light bulb is left on for 3
hours How much electrical energy
was used
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull The law of
conservation
of energy
states that in
any closed
system the
total amount of
energy
remains
constant
bull Power is the rate at which energy is
transformed or the rate at which
work is done
Assignment
bull P 339 3 5-8
112 Electrical Energy and
Power
bull P=Et
bull E=Pt
bull t=EP
P Power Watt W
E Energy Joule J
t time Second s
Example 1
bull A laser pointer used 0045J in 15s
what is its power
Example 2
bull A 100W light bulb is left on for 3
hours How much electrical energy
was used
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull Power is the rate at which energy is
transformed or the rate at which
work is done
Assignment
bull P 339 3 5-8
112 Electrical Energy and
Power
bull P=Et
bull E=Pt
bull t=EP
P Power Watt W
E Energy Joule J
t time Second s
Example 1
bull A laser pointer used 0045J in 15s
what is its power
Example 2
bull A 100W light bulb is left on for 3
hours How much electrical energy
was used
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Assignment
bull P 339 3 5-8
112 Electrical Energy and
Power
bull P=Et
bull E=Pt
bull t=EP
P Power Watt W
E Energy Joule J
t time Second s
Example 1
bull A laser pointer used 0045J in 15s
what is its power
Example 2
bull A 100W light bulb is left on for 3
hours How much electrical energy
was used
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
112 Electrical Energy and
Power
bull P=Et
bull E=Pt
bull t=EP
P Power Watt W
E Energy Joule J
t time Second s
Example 1
bull A laser pointer used 0045J in 15s
what is its power
Example 2
bull A 100W light bulb is left on for 3
hours How much electrical energy
was used
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull P=Et
bull E=Pt
bull t=EP
P Power Watt W
E Energy Joule J
t time Second s
Example 1
bull A laser pointer used 0045J in 15s
what is its power
Example 2
bull A 100W light bulb is left on for 3
hours How much electrical energy
was used
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Example 1
bull A laser pointer used 0045J in 15s
what is its power
Example 2
bull A 100W light bulb is left on for 3
hours How much electrical energy
was used
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Example 2
bull A 100W light bulb is left on for 3
hours How much electrical energy
was used
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Example 3
bull A laptop computer operates on
14W of power If the battery has
200kJ of electrical energy how
many hours can you operate the
computer before recharging
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Assignment
bull Practice Problems p 340-341 1-3
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
112 Power Voltage and
Current
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull P=VI
bull V=PI
bull I=PV
P Power Watt W
V Voltage Volt V
I Current Amperes A
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Example 1
bull A light bulb has a current of 0625A
when it is plugged into a 120V
outlet What is its power
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Example 2
bull The power of a resistor is 05W If
the current is 0382A what is its
voltage
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Example 3
bull An electric gaming system is rated
380W It is plugged into a 120V
outlet what is the current
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Example 4
bull A resistor has a current of 028A
and a voltage of 45V If the current
flows for 50s how much energy is
converted to heat
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Assignment
bull Sample Problems 4-7
bull P 344 1-7 10-11
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
113 Sources of Electricity
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Assignment
bull Read pages 346-347
bull Take notes on the 9 sources of
electricity
bull Complete worksheet
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
114 Household Electrical
Energy
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull A transformer is a device that can
raise or lower voltage It requires
AC
bull A high voltage is required to
transmit power because the current
needs to be low
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Electric Meters
bull An electric meter measures energy in
kilowatthours It is read using rotating
pointers on dials The new smart meters
have a digital display It is not reset to
zero Each month the difference is taken
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull On February 1st the meter reading
was 61 409 kWh On March 1st the
reading was 62 335 kWh
A) Determine the amount of energy
used
B) If the electric company charges
$0065kWh how much does
electricity cost for the month
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull Energuide labels
provide info on
electrical energy
consumption and
efficiency The
bar indicates the
appliancersquos
ranking
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull An appliance has a power rating of
400W If it is used for 2
hoursweek how much energy
does it use If electricity costs
$0085kWh how much does it cost
to use in a week
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
bull P 354 1-3 5 8-12
Review Assignment
bull P 358 1-19
Review Assignment
bull P 358 1-19
