O-LevelPhysicsElectricity5054/11 · Oct/Nov 2013 · Q311 Mark

A transformer is used to operate a 12 V lamp from a 250 V mains supply. The mains current is 0.10 A. The current in the lamp is 2.0 A. What is the efficiency of the transformer?

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A0.048

B0.050

C0.96

D1.04

✓ Correct answer

C: 0.96

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2013 Paper 1 Variant 1, question 31.

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