Question

A battery has six cells in series and each cell has an electromagnetic force $1.5V$ and internal resistance $1\Omega$. If an external load of resistance $24$$\Omega$ is connected to it. The potential drop across the load is

• A. $7.2V$
• B. $0.3V$
• C. $6.8V$
• D. $0.4V$

Answer 1

The correct option is A $7.2V$

$\Rightarrow 6E=I[24+6r]$
$\frac{6\times 1.5}{30}=I$
P.D across load $=$ I x 24
$=\frac{3}{10}\times 24$
$=\frac{3\times 12}{5}=7.2V$