Discussion Forum



1)

Find the potential difference between a and b as shown in the below circuit

1172021219_p14.PNG


A) 165 V

B) 198 V

C) 213 V

D) 224 V

Answer:

Option C

Explanation:

The circuit can be redrawn as,

972021718_p12.PNG

 

 45 V is drop across the branch one, so current through it

$I_{1}=\frac{45}{R_{eq1}}=\frac{45}{\frac{15}{4}}=12 A$

 Now, above circuit can be redrawn as,

972021467_p13.PNG

 Since , in a series circuit, the current flows will be same,

hence, $V_{ab}=I_{ab}R_{eq}(ab)=12\left(\frac{15}{4}+4+10\right)$

$\Rightarrow$          $V_{ab}$=213 V

Hence , the correct option is (c)