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10.4 Mains electricity

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Question 16

A small wind-turbine generator supplies an alternating current to a monitoring station at a frequency of 30 Hz. A sensor records each change in current direction for 4.0 s.

How many changes in direction should the sensor record?

[1]
A

120120120 changes in direction.

B

480480480 changes in direction.

C

606060 changes in direction.

D

240240240 changes in direction.

Markscheme

10.4 Mains electricity Questions

  1. GCSE
  2. /Physics
  3. /10.4 Mains electricity

81 exam-style questions on Edexcel GCSE Physics 10.4 Mains electricity, covering 10.4.1 Direct and alternating current, 10.4.2 Live, neutral and earth wires; safety, 10.4.3 Mains wire potential differences and dangers, and 10.4.4 Power ratings and energy use. Each one has a worked solution and a mark scheme showing where the marks go.

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