Power (Edexcel GCSE Physics Combined Science): Flashcards

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1.1.10 Power
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Define power (energy)

Rate at which energy is transferred

Define power (work)

Rate at which work is done

Power formula using energy

P=EtP = \frac{E}{t}

Power formula using work

P=WtP = \frac{W}{t}

Unit of power

Watts (W)

Unit of energy transferred

Joules (J)

Unit of time in power equations

Seconds (s)

Unit of work done

Joules (J)

Power of 1 joule per second

1 watt

Energy transfer rate for 1 watt

1 joule per second

More powerful motor (same work)

The one that completes work faster

Why faster motor is more powerful

Energy transferred at faster rate

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