SSC JE Electrical Engineering 2017 Set 3 Paper

Internal resistance per cell of lead acid cell is always less then Edision cell.
Internal resistance of a battery is dependent on its size, chemical properties, age, temperature and discharge current.
${\mathit{R}}_{\mathrm{int}}=\left(\frac{{\mathit{V}}_{\mathit{N}\mathit{L}}}{{\mathit{V}}_{\mathit{F}\mathit{L}}}-1\right){\mathit{R}}_{\mathit{L}}$
where ${\mathit{V}}_{\mathit{N}\mathit{L}}$ is Open circuit voltage
where V${}_{\mathit{F}\mathit{L}}$ is Load voltage
R is Load resistance