Question

an electric iron draws a current of 3.4 ampere from the 220 volt supply line what current will this electric iron draw when connected to 110 supply line

Answer 1

V=IR
R=V/I
R=220/3.4 Ohms
=64.705 Ohms

I=V/R
I=110/64.705
=1.7 Amps

Answer 2

Put v = ir
So, value of r is found hence find the value of current, putting new value of v and r
Hence I = 1.7 A