A-LevelPhysicsD.C. circuitsOct/Nov 2018Paper 1 Q341 Mark
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. [Figure 34.1] 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
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