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Direct and alternating potential difference

Direct and alternating potential difference

Potential difference-time graphs showing direct potential difference as a constant positive line and alternating potential difference as a wave crossing 0 V repeatedly, with current in one direction for direct and reversing direction for alternating

Electric current is the rate of flow of charge, and potential difference is the energy transferred per unit charge between two points. A supply can provide direct potential difference, where one polarity is maintained, or alternating potential difference, where the polarity keeps reversing.

Domestic uses and safety Lesson

  1. GCSE
  2. /Combined Science
  3. /Domestic uses and safety

Step-by-step lessons covering AQA GCSE Combined Science Domestic uses and safety for Foundation and Higher tier. Each lesson works through exam-style questions.

Lessons

Current, potential difference and resistanceSeries and parallel circuitsDomestic uses and safetyEnergy transfers