Question

The cell has an $\text{emf}$ of $2\text{V}$ and the internal resistance of this cell is $0.1\Omega$, it is connected to a resistance of $3.9\Omega$. The voltage across the cell will be

• A. $1.95\text{V}$
• B. $1.5\text{V}$
• C. $2\text{V}$
• D. $1.8\text{V}$

Answer 1

The correct option is A $1.95\text{V}$

Current = $\frac{2}{3.9+0.1}=\frac{2}{4}=0.5$
Voltage across the cell
$=2-0.5\times 0.1=2-0.05=1.95V$