Question

an electric geyser has the rating 2000w-220v marked on it .what should be the minimum current rating (in whole number) of the fuse_wire to be used?

Answer 1

acc. to me the ans could be
p = v^2/r
R=V^2/P
=220into 220÷2000
=24.2 ohm
now
I=V/R
=220/24.2
= 9.09 ampere