Saturday 30 March 2013

2.5 know and use the relationship: power = current × voltage


power = current × voltage
P = I × V

3 comments:

  1. you have missed out a bit about apply the relationship to the selection of appropriate fuses

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    Replies
    1. It is the same formula for all the wires

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  2. Apply the relationship to the selection of appropriate fuses:

    You simply have to choose the correct fuse. For the UK the fuses are as follows: 3amps, 5amps, 7amps and 11amps. Appliances should have fuses which blow at a current which is above their rated current. for example an appliance which is rated 7 amps should have a 13 amp fuse because a 7amp fuse would blow at the appliance's rated current. Hope that helps :)

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