CAIE IGCSE Physics 4.3.3.2 Action of a Variable Potential Divider Questions

Practise tracing how variable potential dividers control output p.d., lamp brightness and sensor responses in real circuits.

Exam points

explain how an LDR or thermistor changes supply p.d. share in a divider
predict lamp brightness or voltmeter reading as a slider moves
select X and Y components to make p.d. across Y rise

[Maximum number: 3]

Fig. 8.1 shows a circuit. The circuit is designed to switch on a night light when the surroundings are dark.

Fig. 8.1

The surroundings change from light to dark.
1. State the effect of this change on the resistance of the LDR.
2. State and explain the effect of this change on the p.d. across the light-emitting diode (LED).

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CAIE IGCSE Physics 4.3.3.2 Action of a Variable Potential Divider Questions question 1