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GCSE Level Questions: Transformers

Q7. The diagram shows shows a traditional transformer.

(a)

(i) The potential difference across the secondary coil is less than the potential difference across the primary coil. (Delete incorrect answers).

[1 mark]

(ii) Give a reason for your answer to part (i) and state the name given to theis type of transformer.

It is a 'step-down' transformer. This is clear from the diagram as there are less turns on the secondary coil than on the primary one.

Be careful how you express yourself - it you said coils instead of turns you got no mark... lots of turns of wire make up a coil.

[2 marks]

(b) What is the core of the transformer made from?

Soft iron

Soft iron is magnetically soft (easily gains and loses magnetism) not physically squishy! - See here

[1 mark]

(c) What happens as the magnetic field in the core of the transformer changes? Tick one box.

The mass of the core increases.  
A potential difference is induced across the secondary coil.
The temperature of the core decreases.  

 

[1 mark]

(d) The power supply to the transformer is connected to the mains electricity supply. What is the frequency of the mains electricity supply?

50 Hz

[2 marks]

(e) The power input of the transformer is 2 W. The transformer is 100% efficient.

State the power output of the transformer.

2 W

[1 mark]

(8 Marks Total)