What this topic covers

Electricity is topic 9 of the Cambridge International AS & A Level Physics 9702 syllabus (2025–2027), covering electric current, potential difference and power, and resistance and resistivity. As AS Level content, it is examined in Paper 1 (multiple choice) and Paper 2 (structured questions), and Paper 4 also assumes it as prior knowledge. Students most often struggle to distinguish potential difference from current, to apply Q = It and the three power equations consistently, and to interpret I–V characteristics for metallic conductors, filament lamps, semiconductor diodes, thermistors and light-dependent resistors. Resistivity calculations frequently lose marks through unit errors, particularly when cross-sectional areas are given in mm². The questions below are drawn from past papers and sorted chronologically, so you can practise each idea from first definitions through to multi-step problems.

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Questions in this topic

• 9702/43/M/J/24 Q2 — thermodynamic temperature and resistance thermometers · 7 marks
• 9702/42/O/N/23 Q4 — SHM and current in a rod · 11 marks
• 9702/42/F/M/23 Q9 — ultrasound and impedance · 9 marks
• 9702/41/O/N/21 Q5 — Signal conversion and sampling · 8 marks
• 9702/41/M/J/21 Q8 — thermistor and op-amp circuit · 9 marks
• 9702/42/M/J/21 Q7 — operational amplifier and thermistor circuit · 9 marks
• 9702/43/M/J/21 Q8 — thermistor and op-amp circuit · 9 marks
• 9702/41/M/J/20 Q6 — optical fibres · 7 marks
• 9702/41/M/J/20 Q10 — electron energy levels and band theory · 9 marks
• 9702/42/M/J/20 Q8 — Operational amplifiers and circuits · 11 marks
• 9702/43/M/J/20 Q6 — optical fibres · 7 marks
• 9702/43/M/J/20 Q10 — electron energy levels and band theory · 9 marks
• 9702/42/F/M/20 Q5 — optic fibres and digital transmission · 7 marks
• 9702/42/F/M/20 Q7 — thermistors and strain gauges · 7 marks
• 9702/41/O/N/19 Q5 — coaxial cable and signal transmission · 7 marks
• 9702/42/O/N/19 Q10 — semiconductors and op-amps · 11 marks
• 9702/43/O/N/19 Q5 — coaxial cable and signal transmission · 7 marks
• 9702/41/M/J/19 Q4 — signal transmission · 10 marks
• 9702/42/M/J/19 Q5 — signal transmission · 8 marks
• 9702/42/M/J/19 Q7 — resistance and temperature · 10 marks
• 9702/43/M/J/19 Q4 — signal transmission · 10 marks
• 9702/41/M/J/18 Q11 — Photon and semiconductor resistance · 8 marks

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