Question

When a $24\text{V}$ battery is connected to a resistor, the current in it is $0.4\text{A}$. What will be the current through it when it is connected to a battery of $6\text{V}?$

• A. $0.4\text{A}$
• B. $0.1\text{A}$
• C. $0.2\text{A}$
• D. $0.3\text{A}$

Answer 1

The correct option is B $0.1\text{A}$

We know that,

$V=iR$

$24=0.4\times R\Rightarrow R=60\Omega$

Now,

$I=\frac{V}{R}=\frac{6}{60}=0.1\text{A}$

Alternate method:

$V=iR\Rightarrow R=\frac{V}{i}$

$\Rightarrow \frac{24}{0.4}=\frac{6}{i}$

$\Rightarrow i=0.1\text{A}$