The formula for electrical power is:
POWER = VOLTAGE x CURRENT
Written as the symbols: P = V x I
This equation can be used to work out the fuse that should be used in an appliance. However first you need to work out the current the item will use.
The fuse should be rated* just a little higher that the current.
Fuses come with fixed ratings e.g. 3A, 5A and 13A. You should choose the first one that is just higher than the current.
* Electrical devices come with POWER RATINGS. This is the maximum power a device can use without being damaged or dangerous. This is why it is extremely imporatant that you have the correct size of fuse or MCB because otherwise the fault current would not trip the MCB or blow the fuse. This would either mean that the metal casing would stay live or the cable its self would melt and possibly set on fire.
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