The potential difference required to pass a current 0.2 A in a wire of resistance 20 ohm is ________.

As by looking at the problem we know that we have to find V - potential difference. And the data we are given with is of, current - I which is 0.2 A (ampere) and of resistance - R which is 20 ohm (Ω).

So, by using Ohm’s law relation we can find the potential difference across the conductor with the help of the values of current and resistance.

Mathematically, V (potential difference) = I(current) × R(resistance)

V = 0.2A× 20ohm = 4 V.