A-LevelPhysicsD.C. circuitsOct/Nov 2020Paper 1 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?
A2.4 A
B3.7 A
C4.5 A
D14 A
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The correct answer is B. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
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