A cell of emf 1.5V is connected in series with a 1? resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell

A cell of emf 1.5V is connected in series with a 1? resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell

Answer Details

r = $\frac{E}{I}-R$

r = $\frac{1.5}{0.3}-1$

r = 4$\Omega$