Question

What is the half deflection method?

Answer 1

Half-deflection method:

1. The half deflection technique is a way of analyzing a cell's internal resistance to aid in determining a high-value resistance.
2. The deflection of half would be regarded as a value received only from the cell.
3. A high resistance box is typically connected with the battery in order to bring the deflection of the galvanometer within the scale.

Mathematically, internal resistance can be represented as:

$\mathrm{e}=\mathrm{I}(\mathrm{r}+\mathrm{R})$

Here,

$\mathrm{e}$ is the electromotive force (volts).

$\mathrm{I}$ is the current (A).

$\mathrm{R}$ is the load resistance.

$\mathrm{r}$ is the internal resistance of the cell measured in ohms.

Therefore, the half deflection technique is used to calculate a galvanometer's resistance.