Electromagnetism – Question 3

The diagram shows the basic structure of a transformer.

transformer

(a) Explain how a transformer works.

dotted-11-answer-lines(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.

5 linesCurrent = .................. amps
(2 marks)

 

How did you do? Click to show the mark scheme

electromagnetism mark scheme

From Q9 P3 AQA Specimen Paper (Higher)

Electromagnetism – Question 3 was last modified: October 5th, 2015 by Olly Wedgwood

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