Edexcel IGCSE Physics 2.18 Parallel voltage

Practise comparing voltages in parallel and series parts of circuits, including voltmeter placement and battery voltage reasoning.

Exam points

draw or recognise a voltmeter connected in parallel across the component being measured
explain that parallel branches have the same voltage as the battery across that loop
use voltages adding in a series path to justify a missing voltmeter reading

[Maximum number: 2]

A student builds this electric circuit to measure the temperature of a room.

At $20^{\circ} \mathrm{C}$ , the voltage across the thermistor is 3.9 V .

Explain why the reading on the voltmeter is 2.1 V.

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