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Charge flow and electrical power Charge and current4.1 Energy, power and resistance4.2 Mean drift velocity4.1.2
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Course idea

Mean drift velocity

OCR A AS Physics · 4.1.2

Explore mean drift velocity within charge and current. Electric current is a rate of flow of charge. Connect the macroscopic current to the motion and number of charge carriers in a conductor.

Specification outcomes (3)
  • 4.1.2(a) Define and understand mean drift velocity of charge carriers.
  • 4.1.2(b) Use and apply I = A n e v, where n is the number density of charge carriers.
  • 4.1.2(c) Distinguish between conductors, semiconductors and insulators in terms of number density of charge carriers.
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H156 v2.0 · May 2026

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