Calculating the correct fuse rating

The rate at which energy is transformed is measure in joules per seconds, also know as watts, 1 J/s = 1 watt. The rate of energy transfer is called power:

Power (watts, W) = energy transformed (joules, J) / time taken (seconds, s)

The power rating is the amount of energy an electrical appliance uses per second. The power rating determines the fuse

Power = p.d x current so Current = power / p.d

A blender has a power rating of 1000W. What fuse does it require?

Current = power / p.d so 1000W / 230V = 4.3 A

A 3A fuse would melt when the blender is switched on, and a 13A fuse would not melt if a fault occured. The correct fuse is 5A.

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