Physics 0625 · IGCSE · Electrical safety

Electrical safety — practice question

A microwave oven is built with a metal case and runs from a 240 V electricity supply.
(a)[4]

Explain how the fuse together with the earthed metal case protect the appliance and the user.

(b)[3]

Calculate the secondary voltage $V_s$ of the transformer.

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Earth wire holds case at zero volts / earth potential” …

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