Question

Apply Kirchoff's law to find the current I in the part of the circuit shown below.

• A. 5 A
• B. 3 A
• C. 7 A
• D. 1 A

Answer 1

Answer:

C. 7 A

To apply Kirchhoff's law, we'll consider the current divisions at the junctions.

Step 1: Identify the currents and resistances

We have three branches with currents I, 2 A, and 5 A, and two resistances, 3 Ω and 6 Ω.

Step 2: Apply Kirchhoff's current law (KCL)

The sum of currents entering a junction should equal the sum of currents leaving it.

Step 3: Write the KCL equation

I = 2 A + 5 A

Step 4: Solve for I

I = 7 A

The final answer is: 7​