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CAIE A-Level Physics 19.2.1 Energy from a Potential–Charge Graph

Practise determining capacitor energy from the area under a potential-charge graph, interpreting the graph area, units and stored electric potential energy.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • determine energy stored in a capacitor from the area under a potential–charge graph
  • interpret the graph area and units as electric potential energy

19.2.1—The electric potential energy stored in a capacitor question 1

[Maximum number: 3]

The variation with potential difference V of the charge Q on one of the plates of a capacitor is shown in Fig. 5.1.

Fig. 5.1

Fig. 5.1

The capacitor is connected to an 8.0 V power supply and two resistors R and S as shown in Fig. 5.2.

Fig. 5.2

Fig. 5.2

The resistance of R is 25kΩ25 \mathrm{k} \Omega and the resistance of S is 220kΩ220 \mathrm{k} \Omega.
The switch can be in either position X or position Y .

The switch is in position X so that the capacitor is fully charged.

Calculate the energy E stored in the capacitor.

E=
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