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CAIE A-Level Physics 10.3.1 Potential Divider Principle

Practise explaining and calculating potential-divider output from resistor ratios or a uniform resistance wire, predicting changes in supply or resistance.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • explain the principle of a potential divider and how the output p.d. depends on series resistance
  • calculate output p.d., resistor ratio or an unknown resistance in a potential-divider circuit
  • predict how changing a resistor or supply affects the output while keeping the divider arrangement clear

10.3.1—The principle of a potential divider circuit question 1

[Maximum number: 2]

The slider of the potentiometer in (c) is moved to end A .

State and explain the effect on the brightness of lamps P and Q .
lamp P :
lamp Q:

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