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4.3 Electric circuits

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Question 67

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 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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