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.

Q: What topic does this question test?

This question tests D.C. circuits in A-Level Physics (syllabus code 9702). It is worth 15 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2021 examination, Paper 5 Variant 2 (9702_s21_qp_52.pdf).

Question

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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