CAIE IGCSE Physics 4.3.1 Circuit Diagrams and Circuit Components Topic Practice

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Covered syllabus points

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

Question 1

[Maximum number: 1]

A student designs a circuit to turn on a fan when the temperature increases.
Which component does the student need to use in her circuit?

A
Figure for Question 1 — CAIE IGCSE Physics — Option A
B
Figure for Question 1 — CAIE IGCSE Physics — Option B
C
Figure for Question 1 — CAIE IGCSE Physics — Option C
D
Figure for Question 1 — CAIE IGCSE Physics — Option D

Question 2

[Maximum number: 1]

Fig. 6.1 shows the circuit diagram for a flashlight (torch).

Fig. 6.1

Fig. 6.1

The electromotive force (e.m.f.) of the battery is 4.5 V . The circuit contains a 60Ω60 \Omega fixed resistor. The current in the light-emitting diode (LED) is 0.020 A .

Explain why the LED does not light up if the battery is reversed.

Question 3

[Maximum number: 1]

Fig. 8.1 shows a circuit. The circuit is designed to switch on a night light when the surroundings are dark.

Fig. 8.1

Fig. 8.1

On Fig. 8.1, draw the circuit symbol for a voltmeter used to measure the potential difference (p.d.) across the light-dependent resistor (LDR).

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