Question

An electric geyser has the rating 2000W-220V marked on it. What should be the minimum current rating in the whole number of the fuse wire to be used

Answer 1

Given:
Power=2000w
Voltage=220 v
I=?
P= v*I
I=P/v
=2000/220
=9.09 amp
Fuse rating should be greater than flowing current .
Hence select a fuse of 10 amp

Answer 2

Answer:

The minimum current rating for fuse is 10 A.

Explanation:

The energy used is the amount of charge q moved through voltage V in a time interval t.  

P = VI  

Hence, I = P / V = 2000 / 220 = 9. 09 Amp

Moreover Fuse should always have it’s rating higher than the flowing current so that it can melt and open the circuit in case of excessive current.

So minimum current rating for fuse should be 10 Amp.