Internal Resistance Using Potentiometer

Internal Resistance Using Potentiometer

### Formula

$$r=R\frac{l_1-l_2}{l_2}$$

### Terminologies

- r → Internal resistance.

- R → External resistance.

- l₁ → Balancing length without resistance.

- l₂ → Balancing length with resistance.

### Usage

- Used to calculate internal resistance of a cell.