Physics - Current Electricity Question with Solution | TestHub

According to Kirchhoff's Current Law (KCL), the algebraic sum of currents meeting at a junction is zero, i.e., the total incoming current equals the total outgoing current.

At the first junction (leftmost):
Incoming currents = $2\text{ A}$ and $4\text{ A}$
Outgoing current $I_1=2\text{ A}+4\text{ A}=6\text{ A}$

At the second junction (middle):
Incoming current = $I_1=6\text{ A}$
Outgoing currents = $1\text{ A}$ and $I_2$
$I_2=6\text{ A}-1\text{ A}=5\text{ A}$

At the third junction (rightmost):
Incoming current = $I_2=5\text{ A}$
Outgoing currents = $2\text{ A}$ and $I$
$I=5\text{ A}-2\text{ A}=3\text{ A}$

Answer: 3.A