Physics 0625 · IGCSE · Energy, work and power

Energy, work and power — practice question

An electric kettle holds water at $19\degree\text{C}$. Its power rating is $3.0\,\text{kW}$, and it is left on for 3.5 minutes.
(a)[3]

Calculate how much energy is delivered to the kettle by the electricity supply.

(b)[5]

Calculate how much thermal energy the water gains.

(c)[2]

Calculate the kettle's efficiency.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Energy is equal to power \times time” …

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