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CAIE A-Level Physics AS 9.3.2 V Ir Questions

Use V = IR to calculate potential difference, current and resistance.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Use V = IR to calculate potential difference, current and resistance.

CAIE A-Level Physics AS 9.3.2 V Ir Questions question 1

[Maximum number: 2]

A battery of electromotive force (e.m.f.) E and internal resistance r is connected to a variable resistor of resistance R, as shown in Fig. 6.1.

Fig. 6.1

Fig. 6.1

The current in the circuit is I and the potential difference across the variable resistor is V.

The battery stores 9.2 kJ of energy. The variable resistor is adjusted so that V=2.1 VV=2.1 \mathrm{~V}. Use Fig. 6.2 to:

calculate resistance R

R=
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