Physics 5054 · O Level · Series and parallel circuits

Series and parallel circuits — practice question

A student studies a series circuit that contains two different lamps P and Q. For full brightness, both lamps require a working voltage of 2.5 V. She assembles the circuit shown in Fig. 2.1. The student then connects a voltmeter into the circuit to measure the potential difference (p.d.) across lamp P.
(a(i))[1]

On Fig. 2.1, draw the symbol for a voltmeter to indicate its connection point.

(a(ii))[1]

Fig. 2.2 displays the voltmeter reading. State the value of $V_P$ shown in Fig. 2.2.

(b(i))[1]

Add the value you found in (a)(ii) to the table in Fig. 2.3.

(b(ii))[1]

Fig. 2.4 displays the ammeter reading in the circuit of Fig. 2.1. State the value of $I$ shown on Fig. 2.4.

(b(iii))[1]

The student claims that lamp Q is unlit because its filament is broken. Explain how the results demonstrate that this statement is wrong.

(b(iv))[1]

Suggest one reason why lamp Q does not light.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: Correct voltmeter symbol in parallel with lamp P

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