Question

Find the current I in the given circuit .

• A. 1/25 A
• B. 1/10 A
• C. 1/20 A
• D. 1/5 A

Answer 1

The correct option is B 1/10 A

Total resistance in the circuit is, The resistance in the upper part,

$R_{eq}=R_1+R_2=60\Omega$

Now this resistance is in parallel with the $30\Omega$

so, total resistance given by,

$\frac{1}{R_T}=\frac{1}{R^{}eq}+\frac{1}{R_2}$

$\frac{1}{R_T}=\frac{1}{60}+\frac{1}{30}$

$R_T=20\Omega$

Therefore, current in the circuit is,

$I=\frac{V}{R}=\frac{2}{20}=\frac{1}{10}A$