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CAIE IGCSE Physics 4.3.1 Circuit diagrams & circuit components Question Bank

Practise reading, drawing and explaining circuit diagrams, including component symbols, sensor circuits and diode behaviour.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • draw complete circuit diagrams with correct symbols and series or parallel connections
  • interpret diode circuits and output graphs for current or p.d. direction

Covered syllabus points

4.3.1.1—Circuits with cells, batteries, power4.3.1.2—Circuit diagrams containing diodes and

4.3.1 Circuit diagrams and circuit components question 1

[Maximum number: 2]

The electric starter motor in a car is switched on and off using a relay.
The relay consists of a plastic case and two flexible springy strips, X and Y, which are made of soft iron. These iron strips act as the switch when a circuit is connected between the terminals W and Z.

Fig. 7.1 shows \(\mathrm{X

Fig. 7.1 shows \(\mathrm{X

Fig. 7.2 shows the equipment from Fig. 7.1 inside a magnetising coil. The magnetising coil is in series with the 12 V car battery and switch S , which is open.

Fig. 7.3 shows the relay and the symbols for the car battery and the starter motor.

Fig. 7.3

Fig. 7.3

Fig. 7.3

Fig. 7.3

The springy iron strips X and Y act as the switch for the starter motor circuit.
Complete the circuit diagram for the motor circuit.

4.3.1 Circuit diagrams and circuit components question 2

[Maximum number: 1]

Fig. 6.2 shows two light-emitting diodes (LEDs) connected in parallel in a circuit. R is a red LED and G is a green LED.

The voltmeter across the LEDs shows a potential difference (p.d.) of 2.0 V.

Fig. 6.2

Fig. 6.2

The connections to the power supply are reversed. State the reading on the ammeter.
current =

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