Physics › Section O · Current and circuits › Topic O.3
Electric power and energy
A heater, a lamp and a phone charger all plug into the same outlet, yet they use energy at very different rates. Electric power ties that rate to current and voltage, and it is what the number on every appliance label and every electricity bill is about.
In this topic
- Energy carried by charge
- P = IV
- Three forms for a resistor
- Worked example: a space heater
- Where the energy goes
- Energy, kilowatt-hours and cost
- Worked example: switching to LED
- Worked example: a phone battery
- Heating in wires and cords
- Common mistakes to avoid
- Key takeaways
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