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10.4 Mains electricity

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Question 35
H

A device operates at 80 W for 3.0 h each day. It remains on standby at 4.0 W for the other 21 h.

How much less electrical energy would it receive each day if it were disconnected during standby?

[1]
A

0.252 MJ0.252\ \mathrm{MJ}0.252 MJ

B

0.864 MJ0.864\ \mathrm{MJ}0.864 MJ

C

1.1664 MJ1.1664\ \mathrm{MJ}1.1664 MJ

D

0.3024 MJ0.3024\ \mathrm{MJ}0.3024 MJ

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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