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4.3.3 Action and use of circuit components

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Question 37

A light-dependent resistor (LDR) is used in a circuit to control a piece of equipment automatically.

What might this circuit be used for?

A

sounding an alarm when temperature rises

B

switching on a domestic water heater at a pre-set time

C

turning on street lighting as it becomes dark

D

opening an elevator door when someone walks in front of an infrared beam

Markscheme

4.3.3 Action and use of circuit components Questions

  1. IGCSE
  2. /Physics
  3. /4.3.3 Action and use of circuit components

67 exam-style questions on CIE IGCSE Physics 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.

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