Notes 14
Notes 14.3 Power
Power – rate at which electrical energy is changed into other forms of energy such as heat, sound, motion or light.
• Units: Watts (W), kilowatt(kW) = 1000 W
• A 100-W light bulb uses 100 Joules of electrical energy each second.
• Higher the wattage – more energy you use.
If a 1200-Watt blow dryer is plugged into a household circuit (assume V=120V), how much current is flowing through the heating element?
In a house wired in parallel, the power used by different devices simply adds:
Total Power = P1 + P2 + P3 + …..
What is the maximum wattage that a 20-amp circuit breaker can handle if it is supplied with 120 volts?
How many 100 W light bulbs could run on the circuit?
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Power(watts) = current(amps) x voltage(volts)
P = IV
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