Question

A cell of emf $2V$, when short circuited gives a current of $4A$. What is the internal resistance of the cell?

• A. $0.5\Omega$
• B. $1.0\Omega$
• C. $2.0\Omega$
• D. $4.0\Omega$

Answer 1

The correct option is A $0.5\Omega$

When a cell is short circuited then the internal current given by cell is,

$I=\frac{E}{r}$

$r=\frac{E}{I}$

Here, E is the emf of cell and r is internal resistance

$r=\frac{2}{4}=0.5\Omega$