A-LevelPhysicsCapacitanceFeb/Mar 2020Paper 5 Q215 Marks
A student investigates the discharge of a capacitor through a resistor as shown in Fig. 2.1. E C R A Fig. 2.1 The student initially closes the switch and charges the capacitor. The switch is then opened and a stop-watch is started. The capacitor discharges through the resistor. At different times t the current I is measured. It is suggested that I and t are related by the equation I = (E/R)e^(-t/(CR)) where E is the e.m.f. of the power supply, C is the capacitance of the capacitor and R is the resistance of the resistor.
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