Edexcel IGCSE Physics 6 20p Transformer Power Equation Questions

Substitute primary and secondary voltages and currents into VpIp = VsIs, then rearrange for an unknown value or compare input and output power.

Exam points

State input power = output power for a 100%-efficient transformer, using VpIp = VsIs.
Rearrange VpIp = VsIs to calculate an unknown input or output current, voltage or power, keeping units consistent.
Calculate or compare input and output powers from voltage × current to show that a transformer is approximately 100% efficient.

[Maximum number: 4]

Transformers are useful in the transmission of electricity.

(a)

The diagram shows a step-down transformer.

Figure for Question (a) — Edexcel IGCSE Physics

[ 4 ]

(i)

State the formula linking input power and output power for a transformer.

[ 1 ]

(ii)

The step-down transformer has an input voltage of 275 kV and an output voltage of 230 V.

The transformer has an output current of 95 A.

Calculate the input current to the transformer.

Assume the transformer is 100% efficient.

input current = ............ A

[ 3 ]

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Edexcel IGCSE Physics 6 20p Transformer Power Equation Questions question 1

Question (a)

Question (i)

Question (ii)