Question

On what factors does the internal resistance of a cell depend upon and why?

Answer 1

Internal resistance:

• The opposition to the flow of current offered by the cells and batteries themselves results in the generation of heat is known as the internal resistance of a cell.
• The relationship between Load resistance $\left(\mathrm{R}\right)$, Internal resistance ($\mathrm{r}$) and Emf ($\mathrm{E}$) of cells s given by.$\mathrm{E}=\mathrm{I}(\mathrm{r}+\mathrm{R})$.
• The internal resistance of a cell is directly proportional to the distance between the electrodes and inversely proportional to the effective area of the electrodes
• The internal resistance of a cell is directly proportional to the concentration of the solution that is with the increase in the concentration of the solution, the number of ions per unit volume increases and, in turn, their bombardment also increases.
• The increase in temperature of the solution increases the kinetic energy of the ions present, thus, the internal resistance of a cell also increases