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4.3 Electric circuits

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Question 16

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 Electric circuits Questions

  1. IGCSE
  2. /Physics
  3. /4.3 Electric circuits

136 exam-style questions on CIE IGCSE Physics 4.3 Electric circuits, covering 4.3.1a Circuit diagrams and circuit components, 4.3.2a Series circuits, 4.3.2b Parallel circuits, 4.3.2c Current and potential difference in circuits, 4.3.2d Combined resistance of resistors in parallel, and 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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