A Level · AS · multiple choice
AS Level foundations · Question 5
AS Level foundations · Original GioPhysics question with a detailed, mark-by-mark answer guide.
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multiple choice1 mark
A battery of e.m.f. 9.0 V and internal resistance 1.5 Ω is connected to a resistor of resistance 6.0 Ω. What is the potential difference across the 6.0 Ω resistor?
- A
1.8 V
- B
6.0 V
- C
7.2 V
- D
9.0 V
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Answer overviewCorrect answer: C — 7.2 V
01
1 markAnswer and reasoning
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is C: 7.2 V
- 2
A is the lost volts across the internal resistance. D is the answer of a candidate who treats e.m.f. and terminal p.d. as the same thing, which they are only when no current flows.
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