Question

A current of 0.2A flows through a conductor of resistance 4.5ohm.calculate the potential difference at the ends of the conductor.

Answer 1

Potential difference = Resistance of wire × Current
                                = 4.5 ×0.2
                                = 0.9 volt 

Answer 2

R=4.5Ohm , I=0.2A

V=IR

V=0.2×4.5

V=0.9V