Electricity

• Circuit diagram

  • Used to represent electrical circuits
  • Contains symbols for different components
• Main circuit components

  • Cell/battery
  • Filament lamp
  • Switch
• Current (I)

  A measure of the flow of electrons around the circuit, similar to the flow of water through a pipe, measured in amperes (A)
• Potential difference (V)

  The force driving the flow of electrons, provided by the cell or battery, also known as voltage, measured in volts
• Resistance (R)

  Everything that resists or opposes the flow of electrons, similar to a partial blockage in a pipe, measured in ohms
• Electrons flow from the negative terminal to the positive terminal of a cell or battery
• Conventional current flows from the positive terminal to the negative terminal of a cell or battery
• Electric potential difference (V) is measured in volts, V