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Question

An electrical appliance has a rating of 5 kW200 V. What should be the minimum current rating of the fuse (in A) to be used with the appliance?
  1. 25

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Solution

The correct option is A 25
A fuse wire is made so thin so that when current exceeds the rating of the fuse, it melts hence breaking the circuit.
Power, P=VI
For V=200 V, P=5000 W Given:
I=PV=25 A
So, the current rating of the fuse should be at least 25 A.

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