q1 calculate the potential difference

Question

Calculate the potential difference across the terminals of a cell which has an emf of 1.45V and an internal resistance of 0.5ohms when delievering a current of 0.5A.

Answer 1

Step 1:

The emf of the battery is .

The internal resistance of the cell is

The delivering current is .

Suppose that the battery with emf  and internal resistance supplies a current  through an external load resistor , then the potential difference across the battery is .

Substitute , and in .

Potential difference across the battery is .

Solution:

Potential difference across the battery is .