Question

How does the internal resistance increase?

Answer 1

Internal resistance:

1. Internal resistance is the resistance present between the electrodes inside an electrical source.
2. It is inversely proportional to the area through which the charge travels.
3. The internal resistance of an electrical source depends on the distance between the two electrodes.
4. It also depends upon the internal area of the electrical source.
5. Hence, the internal resistance can be increased by increasing the length between the electrodes and by decreasing the area of the electrical source.
6. Therefore, the internal resistance can be modified according to the range of current required for any purpose.
7. The formula for internal resistance is given as

$\epsilon =I\left(R+r\right)$

where $\epsilon$ is the emf of the cell, $r$ is the internal resistance, $I$ is the current through the circuit and $R$ is the resistance of the resistor.