Alternating current and direct current

3 marks · Normal

A coffee machine is labelled 900 W, 230 V. Calculate:

(a)

The current it draws from the mains when operating normally. Give your answer to 2 decimal places.

[3 marks]

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(a) 3.91 A

Common mistakes: Dividing voltage by power

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Marking points

M1 (a) · 1 mark · Rearrange to .

M2 (a) · 1 mark · Substitute correct values: 900 W and 230 V.

A1 (a) · 1 mark · Correct final answer: 3.91 A to 2 decimal places.

Worked solution

Using (to 2 decimal places).