Skip to content

Course home

Sign up

4.3 Electric circuits

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103
Question 29

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

switching on a room heater when the temperature falls

B

turning on street lights automatically as it becomes dark

C

sounding an alert when a safe door is opened

D

activating a garden sprinkler system at a pre-determined time

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.

Question bank