Question

the potential difference V when the current is 0.5A​

Answer 1

In other words, 1 Volt equals 1 Ampere times 1 Ohm, or commonly V = I*R. Ohm's Law states that for a linear circuit the current flowing through it is proportional to the potential difference across it so the greater the potential difference across any two points the bigger will be the current flowing through it.

Answer 2

it is a very easy questions