if a cell supplies a current of 0.5a when it's emf is 2v and internal resistance is 1 ohms calculate it's external resistance a). 0.5ohms b). 1ohms c). 2ohms d). 2.5ohms e). 3ohms?

Answer 1

I*r + I*R = 2 volts.
0.5*1 + 0.5R = 2,
R = 3 ohms.