Edexcel IGCSE Physics 6 20p Transformer Power Equation Questions

Practise using transformer power equality to calculate input or output current, compare powers and find efficiency from V, I and power data.

Exam points

state input power = output power for a 100% efficient transformer
calculate current using VpIp = VsIs, keeping kV, V, kA and A consistent
find transformer efficiency by comparing useful output power with total input power

[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)