A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2010 · Q321 Mark
A high-resistance voltmeter connected across a battery reads 6.0 V. When the battery is connected in series with a lamp of resistance of 10 Ω, the voltmeter reading falls to 5.6 V. Which statement explains this observation?
AThe electromotive force (e.m.f.) of the battery decreases because more work is done across its internal resistance.
BThe e.m.f. of the battery decreases because work is done across the lamp.
CThe potential difference (p.d.) across the battery decreases because more work is done across its internal resistance.
DThe p.d. across the battery decreases because work is done across the lamp.
✓ Correct answer
C: The potential difference (p.d.) across the battery decreases because more work is done across its internal resistance.
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