Discussion Forum

1)

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

Answer:

Option C

Explanation:

The circuit can be redrawn as,

 

 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,

 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)