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Ohm’s LawOhm’s Law
This presentation is designed to give you the added principles of Ohms’
Law
Learning Objectives- Upon Learning Objectives- Upon completion of this lesson…completion of this lesson…
Students will know the various variables of Ohm’s Law and what they signify
Students will know the relationships of the variable
Students will know how to compute the missing variable given the other two
P=PowerP=Power
Power is the measure of how much work can be done in a given amount of time
Power is measure in “Watts/W”
V=VoltageV=Voltage
Voltage is the amount of work done per unit of charge
Voltage is measured in Joules per CoulombIt is often thought of as the amount of
“energy” being appliedThe unit applied is “Volts/V”
I= CurrentI= Current
Current is the flow of electrical charge through a system
Current is measure in amperes, which is equivalent to 1 coulomb per second
The unit applied is “Amperes/Amps”
Ohm’s LawOhm’s Law
Ohm’s LawOhm’s Law
Solving for “P”Solving for “P”
• Cover “P”• Remaining formula is “V x I”• Meaning as voltage or current increases the
power will increase• Giving power a direct relationship to the
other two variables
Ohm’s LawOhm’s Law
Solving for “V”Solving for “V”
• Cover “V”• Remaining formula is “P/I”• Meaning as power or current increases the
voltage will decrease• Giving voltage an inverse relationship to
the other two variables
Ohm’s LawOhm’s Law
Solving for “I”Solving for “I”
• Cover “I”• Remaining formula is “P/V”• Meaning as power or voltage increases the
resistance will decrease• Giving current an inverse relationship to the
other two variables
Practice ProblemPractice Problem
Ohm’s LawOhm’s Law
SolutionSolution
Practice:Practice:With a partner fill in the missing values from the tableWith a partner fill in the missing values from the table
60W 120 V ? Amps
100 W 40 V ? Amps
? W 60 V 0.2 Amps
40 W ? V 20 Amps
120 W ? V 10 Amps