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Presentation transcript:

Power

An electrical circuit is a tool to transfer energy, energy is delivered by the circuit to the load. Power is the rate at which electrical energy is supplied to a circuit or consumed by a load.

The symbol for power is P and the units are watts (W). For this calculation time must be measured in seconds. Power = Energy = E = P Time t

Example A If you have a circuit with a 750J battery and a current over 3 minutes? 3min x 60 s = 180s P = E / t = 750J / 180s = 4.17 W

Example B How long would a 100 watt bulb last if you had 1500J of energy? t = E/P = 1500J / 100W = 16 seconds

Practice Problems How many watts is a bulb if it uses 9000J in a minute? P=E / t = 9000J / 60s = 150 W

2. If a 1605J battery is used over 5 2. If a 1605J battery is used over 5.0 minutes, what is the power produced? 5.0 min x 60s = 300s P=E / t = 1605J / 300s = 5.35 W

3. How long would it take a 100watt bulb to use 2500J? t = E / P = 2500J / 100 W = 25 seconds

4. In one house how many joules is used by a 50watt bulb? E = t x P = 3600 s x 50 W = 180,000J

5. If a battery produces 1 million joules, in an house how many watts will it produce? 1000000J / 3600s = 278watts