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Current, potential difference and resistance
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Charge flow in a circuit

Charge flow in a circuit

Circuit with a cell, ammeter in series, resistor, voltmeter in parallel across the resistor, and an arrow showing conventional current A circuit is a closed loop that lets charge move. In metal wires the moving particles are electrons, but conventional current is defined as the direction positive charge would flow.

Current, potential difference and resistance Lesson

  1. A Level
  2. /Physics
  3. /Current, potential difference and resistance

Step-by-step lessons on Edexcel A Level Physics Current, potential difference and resistance. Each one builds up to exam-style questions. Physics is one of the most mathematically demanding A Levels -- at least 40% of the marks across the three papers require maths skills at Level 2 (GCSE) standard or above, so build calculation and graph-handling fluency alongside the conceptual content from the start.

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