ENERGY IN TRANSFORMERS

1 mark · Normal

A transformer has an input power of 75 W. Assuming 100% efficiency, which one of the following is the output power?

A50 WB60 WC75 WD150 W

› Show answer

Correct option: 75 W

Common mistakes: Halving or doubling the input power

› Show mark scheme and worked solution

Marking points

A1 · 1 mark · Chooses 75 W.

Worked solution

For 100% efficiency, output power equals input power: 75 W.

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