Physics 5054 · O Level
Electric circuits
13 practice questions on Electric circuits, with worked solutions and instant marking.
In which circuit does the voltmeter show a reading of $7.2\,\text{V}$?
May/June 2015
A potential divider contains a thermistor and a light-dependent resistor (LDR). Under which conditions is the voltage $V$ across the LDR the smallest?
May/June 2016
A $6.0\ \text{V}$ battery is linked to a circuit network that includes five identical resistors. One voltmeter lead is attached to point K, as shown. To which point should lead L be joined so that the voltmeter shows $3.0\ \text{V}$?
May/June 2016
The diagram illustrates an alarm system. What occurs when battery P is disconnected?
May/June 2018
The diagram illustrates a simple electrical circuit. Which statement cannot be true?
May/June 2019
A teacher makes use of the circuit diagram shown. The matching lamps X and Y are linked to a low voltage a.c. power supply through high resistance transmission wires. Both lamps are turned on. Lamp X is then turned off. Lamp Y remains on. What effect does this have on the voltage and the power delivered to lamp Y?
May/June 2019
Inside a box there is an unknown electrical component. It is joined to two external terminals P and Q on the outside of the box. As shown in the circuit diagram of Fig. 4.1, a battery, an ammeter, a switch, a lamp and two crocodile clips are connected. The unknown component is either a broken wire or a connecting wire or a diode.
May/June 2019
A light-dependent resistor (LDR) is used to detect how bright the light is in a room.
May/June 2022
In the circuit diagram, a variable resistor $R$ is connected in parallel with the lower part of a potential divider. The resistance of $R$ rises. What change occurs in the two voltmeter readings $V_1$ and $V_2$?
May/June 2023
The glass tube makes up the main body of a cathode-ray oscilloscope. Electrons are released from a hot metal filament at one end of the tube.
Oct/Nov 2017
A student assembles the circuit in Fig. 7.1. The electromotive force (e.m.f.) of the battery is $6.0\,\text{V}$. Variable resistor X is adjusted to $1.8\,\Omega$.
Oct/Nov 2018
In a laboratory at room temperature, a student assembles the circuit shown in Fig. 10.1. The battery has an electromotive force (e.m.f.) of 12 V, and the switch is then closed.
Oct/Nov 2018
A student assembles the circuit shown. The lamp remains unlit. What would cause the lamp to light?
Oct/Nov 2023