Edexcel IGCSE Physics 6 19p Transformer Turns Ratio Questions

Label input and output coils as primary and secondary, substitute their voltages and turns into Vp/Vs = Np/Ns, then rearrange for an unknown value.

Exam points

State or rearrange Vp/Vs = Np/Ns, keeping primary/secondary voltages and turns labelled consistently.
Calculate an unknown primary/secondary voltage or coil-turn count from table data by substituting into the transformer turns-ratio equation.
Interpret turns–voltage data: output voltage rises with secondary turns and falls as primary turns increase.

[Maximum number: 1]

The diagram shows a step-down transformer.

State how the primary coil of the transformer can be changed to increase the output voltage.

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