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  1. 1. Voltage The Volt symbol v is the electrical pressure available to cause a flow of current to a load when an electric circuit is completed.
  2. 2. Current •! The electrons flow from (-) to (+). ELECTRON FLOW •! The flow of electrons is called CURRENT. •! CONVENTIONAL CURRENT Flow is (+) to (-). •! Conventional Current flow is the Australian Standard. •! The unit of measurement is the ampere we use Amps •! The symbol is A
  3. 3. Resistance A circuit must have opposition to current flow. High resistance means no current flow i.e open circuit Low resistance means high current flow i.e. short circuit Unit: OHM Symbol: Ω

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