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AQA · GCSE · Combined Science · Higher

Energy transferred E, power P and time t equation

Q02.3 1 mark

A different student did not have a joulemeter and calculated the energy transferred by the electric heater. Use the Physics Equations Sheet to answer questions 02.3 and 02.4.

Write down the equation linking energy transferred (E)(E), power (P)(P) and time (t)(t).

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Marking points

  1. 1 State the correct equation, for example P=EtP=\dfrac{E}{t} or power=energy transferredtime\text{power}=\dfrac{\text{energy transferred}}{\text{time}}.

Full-mark answer

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

Why this answer loses marks

P=EtP=Et

Power is energy transferred divided by time, not energy multiplied by time.

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