O-LevelPhysicsElectricity5054/11 · Oct/Nov 2011 · Q291 Mark

A lamp, designed to work at 1.5 V, is connected to a cell of electromotive force (e.m.f.) 1.5 V. The lamp lights at normal brightness. The lamp is now connected to four similar cells, each of e.m.f. 1.5 V, arranged in parallel. What is the effect of connecting the extra cells in this way?

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AThe lamp burns out.

BThe lamp is dimmer.

CThe lamp produces light for a longer time.

DThe lamp produces light for a shorter time.

✓ Correct answer

C: The lamp produces light for a longer time.

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, Oct/Nov 2011 Paper 1 Variant 1, question 29.

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