The diagram shows the basic structure of a transformer.

(a) Explain how a transformer works.

(5 marks)

(b) A transformer is used to change the 230 volt mains electricity supply to the 12 volts needed to operate a low voltage halogen lamp. The current through the halogen lamp is 4 amps.

Calculate the current drawn by the transformer from the mains electricity supply.

Assume that the transformer is 100% efficient.

Write down the equation you use, and then show clearly how you work out your answer.

Current = ……………… amps
(2 marks)

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From Q9 P3 AQA Specimen Paper (Higher)