Measuring ElectricityMeasuring Electricity

What do you know?What do you know?

ElectricityElectricity Energy/Saving Energy/Saving EnergyEnergy

ElectricityElectricity Where does electricity Where does electricity

come from?come from?• 49% coal, 20% natural 49% coal, 20% natural

gases, 19.4% nuclear, gases, 19.4% nuclear, 7% hydroelectric, 3% 7% hydroelectric, 3% oil, 2.3% other gases, oil, 2.3% other gases, 0.4% other renewables, 0.4% other renewables, 0.3% other 0.3% other

WattWatt• Used in electric Used in electric

measurements, to give measurements, to give the rate at which the rate at which energy is usedenergy is used

• 1,000 watts=1 kilowatt1,000 watts=1 kilowatt• How many watts do you How many watts do you

think each of these think each of these devices use?devices use?

Energy/Saving EnergyEnergy/Saving Energy EnergyEnergy

• The ability to do work or The ability to do work or the ability to move an the ability to move an objectobject

How to Save EnergyHow to Save Energy• When your cell phone is When your cell phone is

done charging unplug done charging unplug the charger from the wallthe charger from the wall

• Compact florescent light Compact florescent light bulbsbulbs

• Use products with Use products with Energy Star labelEnergy Star label

• Don’t leave water Don’t leave water runningrunning

Kill A WattKill A Watt This device is used to act as This device is used to act as

a meter going between the a meter going between the item that draws power and item that draws power and the power sourcethe power source

To use the Kill A WattTo use the Kill A Watt• Plug the Kill a Watt into a wall Plug the Kill a Watt into a wall

socketsocket• Insert the plug for the electric Insert the plug for the electric

device you want to testdevice you want to test• Press the grey Watt button Press the grey Watt button

and write down the power and write down the power readingreading

• Converting to kilowattsConverting to kilowatts kW= Watt/1000kW= Watt/1000

• Converting to cost per dayConverting to cost per day Cost=kW x 24 x 0.11Cost=kW x 24 x 0.11

DeviceDevice WattsWatts

OnOnkWkW

OnOnCostCost

OnOnWattsWatts

OffOffkWkW

OffOffCostCost

OffOff

FanFan

RadioRadio

CellCell

LaptopLaptop

MicrowaveMicrowave

RefrigeratorRefrigerator

Measuring Electricity Table

Graphing ExampleGraphing Example

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Fan Microwave Cell Laptop Refrigerator Radio

On

Off

Device

Cost

per

year