Power, Work and Energy in Electrical Circuits

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Power, Work and Energy in Electrical Circuits
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Potential Difference
1 J
1 V
1 C
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Power Units
1 J
1 C
1 V
1 A
1 C
1 s
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Power
PVI
Work
WP t WV I t
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Work-Energy Theorem
WDTE
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Heating
In the real world, much of the electrical energy
of a circuit is turned into thermal energy.
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Kilowatt-Hours
Most electric bills are calculated using the
kilowatt-hour as the unit. A kilowatt-hour is an
amount of energy.
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Cost - 20 kWhr
What is the cost of running a 60 W incandescent
bulb for 1000 hours?
What is the cost of running a 13 W CF bulb for
1000 hours?