# Electric Circuits Questions and Answers – Kirchhoff’s Laws

This set of Electric Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Kirchhoff’s Laws”.

1. KCL is based on the fact that
a) There is a possibility for a node to store energy.
b) There cannot be an accumulation of charge at a node.
c) Charge accumulation is possible at node
d) Charge accumulation may or may not be possible.

Explanation: Since the node is not a circuit element, any charge which enters node must leave immediately.

2. Relation between currents according to KCL is

a) i1=i2=i3=i4=i5
b) i1+i4+i3=i5+i2
c) i1-i5=i2-i3-i4
d) i1+i5=i2+i3+i4

Explanation: According to KCL, entering currents=leaving currents.

3. The algebraic sum of voltages around any closed path in a network is equal to ____________
a) Infinity
b) 1
c) 0
d) Negative polarity

Explanation: According to KVL, the sum of voltages around the closed path in a network is zero.

4. Calculate potential difference between x and y

a) 4.275v
b) -4.275v
c) 4.527v
d) -4.527v

Explanation:

I1 = 3/3+5 = 3/8 = 0.375Ω
I2 = 4/5 = 0.8Ω
Vxy = vx – vy
Vx + 5I1 + 4 – 2I2 – vy = 0
Vx – vy = 2I2 – 4 – 5I1 = -4.275Ω

5. Find R-value from the below circuit?

a) 17.5 Ω
b) 17.2 Ω
c) 17.4 Ω
d) 17.8 Ω

Explanation:

KVL: 70 – 5I – 7(I – 2) = 0
I = 7A
KVL to 2nd loop: 7(I – 2) – 2R = 0
R=17.5Ω
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6. Determine currents I1 , I2 and I3.

a) -3.3A, -8.5A, 2.4A
b) 3A, -8A, 2A
c) 3.3A, 8.5A, -2.4A
d) 3.2A, 8.6A, 2.3A

Explanation:

I1 = I1 – I2 + 8 + I3 + 3
I2 – I3 = 11 -> 1
And -11 I1 – 7(I1 – I2) = 0
-18 I1 + 7 I2 = 0 -> 2
And -11 I1 – 15 I3 =0 -> 3
Solving I1 = 3.32A I2 = 8.5A I3 = -2.4A.

7. All _____________ are loops but _______________ are not meshes
a) Loops, Meshes
b) Meshes, loops
c) Branches, loops
d) Nodes, Branches

Explanation: A mesh cannot be divided further in loops.

8. Solve and find the value of I.

a) -0.5A
b) 0.5A
c) -0.2A
d) 0.2A

Explanation: Veq = 10 + 5 -20 = -5u
Req = 5 + 2 + 3 = 10Ω
I = V/R = -5/10 = -0.5A.

9. The basic laws for analyzing an electric circuit are :-
a) Einstein’s theory
b) Newtons laws
c) Kirchhoff’s laws

Explanation: Kirchhoff’s laws are used for analyzing an electric circuit.

10. A junction whell two (or) more than two network elements meet is known as a ______________
a) Node
b) Branch
c) Loop
d) Mesh

Explanation: Node is a junction where two or more than two network elements meet.

Sanfoundry Global Education & Learning Series – Electric Circuits.

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