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4.3 Electric circuits

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Question 2

A light-dependent resistor (LDR) is used in a control circuit to operate an electrical appliance automatically.

What might this circuit be designed to do?

A

Sounding a buzzer when a refrigerator door is left open

B

Operating a heating system when the indoor temperature drops

C

Turning on street lights automatically at dusk

D

Switching off a microwave oven after a set duration

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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