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Electric Current and Charge 

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1

Electric Current

Electric current is the rate of flow of electric charge.

  • In a conventional circuit this is the flow of electrons

  • Positive and negative ions can also move, like in electrolysis

2

Conventional Current

By convention we say that current goes from the positive to negative terminals of a cell - in fact the negative electrons move in the other direction.

3

Current: Example A

This example looks at the charge transferred by a toaster when it's used to toast bread.

4

Current: Example B

Here we can work out how long a set of LED lights will work for.

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