Physics (AS & A Level) · Oct / Nov 2018 · Paper 12 · Question 34
9702Potential difference and power
An electrical device of fixed resistance 20 Ω is connected in series with a variable resistor and a battery of electromotive force (e.m.f.) 16 V and negligible internal resistance. What is the resistance of the variable resistor when the power dissipated in the electrical device is 4.0 W?
- A16 Ω
- B36 Ω
- C44 Ω
- D60 Ω
As printed in the paper
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Correct answer: A. 16 Ω
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