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Direct and alternating current

Direct and alternating current

A direct current, or d.c., flows in one direction only. Its size may vary, but its direction does not reverse; cells, batteries and solar cells are common d.c. sources.

10.4 Mains electricity Lesson

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

Step-by-step lessons 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 builds up to exam-style questions. Master the required practical work and core equations early, since both papers can draw on content and maths skills from across the whole specification.

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