A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2020 · Q341 Mark

In the circuit shown, a fixed resistor X is connected in series with a battery and a variable resistor. [Figure 34.1] The power dissipated in resistor X is 7.2 W when a current of 3.0 A passes through it. The variable resistor is adjusted so that the power dissipated in X increases by 50%. What is the new current in the circuit?

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A2.4 A

B3.7 A

C4.5 A

D14 A

✓ Correct answer

B: 3.7 A

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2020 Paper 1 Variant 2, question 34.

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