Question

Find the potention difference across a resistance whose effective resistance is 10R and its current is 2A

Answer 1

Given, R=10
I= 2
We know that V=IR
V=10×2
V=20 volt

Answer 2

We know, R = V/I
V = R × I
V = 10 × 2
V = 20 V

In short, Your Answer would be 20 volts

Hope this helps!