Physics 5054 · O Level · Circuit diagrams and circuit components
Circuit diagrams and circuit components — practice question
An electric circuit includes a battery, a fixed resistor R, a voltmeter and a thermistor.
Fig. 7.1 shows an incomplete circuit diagram of this setup.
The thermistor is linked between terminals T$_1$ and T$_2$.
(a)[1]
Finish Fig. 7.1 by drawing the thermistor circuit symbol connected between T$_1$ and T$_2$.
(b(i))[2]
The resistance of R is $2.5\,\Omega$. The voltmeter shows $0.40\,\text{V}$.
Calculate the current in R.
(b(ii))[2]
Calculate the power transferred in R.
(c)[2]
The thermistor’s temperature rises.
Explain what happens to the reading on the voltmeter.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Thermistor symbol correctly drawn between T1 and T2” …