When a circuit is working, and electrical charge is flowing through a component energy is being transferred.

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

  • The equation energy = power x time
  • The equation work done = charge x potential difference
  • How a transformer works.
  • Why electrical current is transmitted at a high voltage across the national grid.

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    		 P3.2 - What determines the current in an electric circuit?