Power (AQA GCSE Physics): Flashcards

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Power
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Power measures

Rate at which work gets done

Unit of power

Watts (W)

1 watt equals

1 joule per second (1 W=1 J/s1 \text{ W} = 1 \text{ J/s})

Power formula (with energy transferred)

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

Power formula (with work done)

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

Higher power rating means

More energy transferred per second

Typical hairdryer power rating

1500 W

Typical TV power rating

50 W

Typical microwave oven power rating

850 W

Typical jet engine power rating

8.2×1078.2 \times 10^7 W

1 gigawatt (1 GW) in watts

1×1091 \times 10^9 W

When calculating power, time must be measured in

Seconds

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