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Physics · Chapter 7: Circuits and charge

Year 11 Science · About 16 minutes with activities · Turn your sound on

Chapter 7 · Circuits and charge
What moves?inside the wire, when the bulb lights
Electrons driftthe metal’s cations stay still
Circuit builderplace parts in the slots, then close the switch

Chapter 7 recap

  • Conductors let current flow easily (low resistance); insulators don’t (high resistance).
  • In a metal, cations stay still and delocalised electrons drift. Current is the rate of flow of charge: 1 A = 6.24 × 10¹⁸ electrons per second.
  • Voltage is energy per unit charge; resistance reduces current. Series: one pathway. Parallel: multiple pathways.
  • Next: Chapter 8 · Circuit rules and V = IR

What's actually moving in a wire when a light turns on?

Chapter 7 · About 16 minutes · sound on

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