Question

A resistor of $10\Omega$ connected across a cell of emf 12 V, draws the current of 1.1 A. Find the internal resistance of the cell.

• A. $10\Omega$
• B. $0.1\Omega$
• C. $10.9\Omega$
• D. $0.91\Omega$

Answer 1

The correct option is D $0.91\Omega$

Given,

$R=10\Omega$

$i=1.1A$

$V=12V$

Applying Kirchhoff's voltage law,

$V=i(R+r)$

$R+r=\frac{V}{i}=\frac{12}{1.1}$

$r=10.91-10=0.91\Omega$

The correct option is D.