Question

Flashlight batteries is having electro-motive force of 1.5 v and internal resistance of one owns are connected to a resistor

of 5 ohms calculate the current in this resistor if the cell are connected to series or parallel

Answer 1

The current:

$$I=\frac V{R+r}=\frac{1.5}{1+5}=0.25\text{ A}.$$