Power (AQA GCSE Physics Combined Science): Flashcards

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Power
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What does power measure?

Rate of energy transfer or work done

Unit of power

Watts (W)

Definition of 1 watt

1 joule transferred per second

Power formula (energy & time)

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

Power formula (work & time)

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

Energy formula (power & time)

E=P×tE = P \times t

Hairdryer power rating

1500 W

Nuclear power station output

1 GW or 1×1091 \times 10^9 W

Work done by force formula

W=F×sW = F \times s

Gravitational potential energy formula

Ep=mghE_p = mgh

Time unit for power calculations

Seconds (always convert minutes to seconds)

Higher power rating means

Faster energy transfer

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