CAIE IGCSE Physics Simple Transformer Construction

Practise drawing and labelling primary and secondary copper coils on a soft-iron core, then use turn numbers to identify step-up or step-down designs.

Exam points

draw separate primary and secondary coils wound around the same closed soft-iron core
label copper coils for low resistance and soft iron for easy magnetisation and demagnetisation
show fewer secondary turns for a step-down transformer and more for a step-up transformer

[Maximum number: 1]

Fig. 10.1 shows a transformer that consists of two coils P and Q, and an iron core.

Fig. 10.1

There are 200 turns on coil P and 340 turns on coil Q.

A4.0 V a.c. power supply is connected to coil P.

Explain why the core of the transformer is made of soft iron.

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4.5.6.1—Construction of a simple transformer question 1