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4.5.5 The d.c. motor

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Question 26

A small electric fan is powered by a simple d.c. motor. Which of the following modifications will decrease the speed of rotation of the fan?

A

Replace the permanent magnets in the motor with stronger ones.

B

Increase the voltage of the d.c. power supply.

C

Decrease the number of turns of wire on the coil.

D

Insert a soft iron core into the center of the coil.

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4.5.5 The d.c. motor Questions

  1. IGCSE
  2. /Physics
  3. /4.5.5 The d.c. motor

31 exam-style questions on CIE IGCSE Physics 4.5.5 The d.c. motor. Each one has a worked solution and a mark scheme showing where the marks go.

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