A-LevelPhysicsD.C. circuitsOct/Nov 2010Paper 1 Q331 Mark
A battery of e.m.f. 12 V and internal resistance 2.0 Ω is connected in series with an ammeter of negligible resistance and an external resistor. External resistors of various different values are used. [Figure showing a battery with internal resistance, connected to an ammeter and an external resistor.] Which combination of current and resistor value is not correct?
Acurrent/A: 1.0, external resistor value/Ω: 10
Bcurrent/A: 1.2, external resistor value/Ω: 8
Ccurrent/A: 1.5, external resistor value/Ω: 6
Dcurrent/A: 1.8, external resistor value/Ω: 4
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The correct answer is D. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
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