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4.3 Electric circuits

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Question 49

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

turning on street lights when it becomes dark.

B

sounding a warning buzzer when a room becomes too warm.

C

triggering a security alarm when a pressure pad is stepped on.

D

switching on a central heating system at a specific time of day.

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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