Electric current is the rate of flow of charge around a circuit.

In this topic you need to know about the following: -

  • The equation charge = current x time
  • The equation potential difference = current x resistance
  • Draw circuit diagrams and symbols correctly.
  • What resistance is and how this affects current.
  • What lamps, diodes, LDRs thermistors and resistors do.
  • Use the arrows below to continue to revise.