A cell has an open circuit voltage V1 and a closed circuit voltage V2 when a current is flowing through it. Therefore, the internal resistance of the cell is
Correct Answer: Option D
From the relationship between EMF, Potential difference and the lost voltage we have that
E = V+v
Where E is the open circuit voltage when it is not driving any current to the external circuit
V is the closed circuit voltage the cell is now supplying current to the external circuit
v is the lost voltage
Relating this to the questions, you have
V1 = V2 + v
v = Ir
So, we have;
V1 = V2 + Ir
V1 – V2 = Ir
r = (V1 – V2)/I
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His Name is Tiamiyu Abdulbazeet Olawale. He is a student at the University of Ilorin studying Electrical and Electronics Engineering. He likes to give the latest updates about Nigeria and international institutions as he aims at helping people to lay their hands on the right information.