A-LevelPhysicsD.C. circuitsMay/June 2021Paper 5 Q215 Marks
A student investigates the current in a circuit containing a cell, as shown in Fig. 2.1. A E r R1 R2 P Q Fig. 2.1 The student connects two resistors of resistances R₁ and R₂ between P and Q. The ammeter measures the current I. The student repeats the experiment with different resistors between P and Q. It is suggested that I, R₁ and R₂ are related by the equation E = I(R₁ + R₂ + r) where E is the electromotive force (e.m.f.) and r is the internal resistance of the cell.
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