A-LevelPhysicsD.C. circuitsMay/June 2019Paper 5 Q215 Marks
A student is investigating a rotary variable resistor, as shown in Fig. 2.1. [Figure 2.1] The variable resistor is connected to a battery of electromotive force (e.m.f.) E and negligible internal resistance, as shown in Fig. 2.2. [Figure 2.2] The student uses a protractor to measure the angle θ through which the spindle of the variable resistor is rotated and records the current I. The experiment is repeated for different angles. It is suggested that I and θ are related by the equation E = IKθ where K is a constant.
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