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4.3.3 Action and use of circuit components

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Question 10

In which automated home system circuit would a Light-Dependent Resistor (LDR) not be useful?

A

to switch on outdoor security lights automatically at dusk

B

to adjust the screen brightness of a television based on the room's ambient lighting

C

to trigger a security alarm when a laser beam across a doorway is blocked

D

to turn off an electric space heater when the room reaches a comfortable temperature

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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