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Mains supply and current direction

Mains supply and current direction

Current-time graphs comparing mains alternating current with battery direct current, showing a sinusoidal a.c. wave and a constant d.c. line An electric current is the flow of charge, measured in amperes, A. Potential difference, or voltage, is the energy transferred per unit charge, measured in volts, V.

Mains electricity Lesson

  1. IGCSE
  2. /Physics
  3. /Mains electricity

Step-by-step lessons on Edexcel IGCSE Physics Mains electricity. Each one builds up to exam-style questions. Build a strong foundation in mechanics and electricity before tackling the more mathematically demanding astrophysics and nuclear topics.

Lessons