Sun September 16, 2012 By:

You are given two fuse wires A and B with current rating 2A and 5A respectively.Which of the two wires would you select for fuse with a 1000W,220V room heater. Justify your answer.

Expert Reply
Wed September 19, 2012
power, P = VI
thus current flowing through a device will be:
I = 1000/220 =100/22 = 50/11 A
thus we can use a 5A fuse.
as  it will burn out as current is just increased over 50/11A.
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