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4.3 Electric circuits

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Question 45

An electromagnetic relay is used in some electrical circuits. What is its primary function?

A

to increase alternating voltage from a low value to a high value

B

to protect a circuit by opening the contacts when the current is too large

C

to use a small current in one circuit to switch on a larger current in another circuit

D

to convert alternating current (AC) into direct current (DC)

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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