Circuits and network analysis

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Arulmigu Meenakshi Amman college of Engineering
Vadamavandal-604410.
Prepared by,
V.Umapathy,
Prof./Mech.
Imortant Questions and Answers
EC25C02- Circuits and Network Analysis
Syllabus
1. Circuit Laws and Network Theorems: Basic electrical components, voltage, current,
power, Network terminology- Node, Junction, Branch, Loop, Short and Open Circuits, DC
and AC circuits, Ohm's Law, Kirchhoff‘s Laws, Resistors, inductors, and capacitors in series
and parallel, voltage and current division rule, Mesh and Nodal Analysis for AC and DC
circuits, Source transformation techniques, Star delta transformation techniques, principle of
linearity, Thevenin’s and Norton’s theorems, Superposition theorem, Maximum power
transfer theorem, Reciprocity theorem.
Practical:
1. Verifications of KVL & KCL.
2. Verification of Mesh and Nodal analysis of DC circuits
3. Verification of Thevenin’s and Norton’s theorems
2. Steady-State and Transient Analysis of Ac and DC Circuits: Components behavior (R, L,
and C) in AC and DC, Characteristics of sinusoids, Phasor relationship for R, L, and C,
Phasor diagram, Natural and forced response, Steady-state and Transient analysis of RL, RC,
RLC circuits using Laplace Transform.
Practical:
1. Create a physical model of an RL, RC, or RLC circuit to observe its transient and
steady-state behaviour using LTspice (open-source)
3. Resonance and Coupled Circuits: Natural frequency and Damping ratio, Series resonance,
Parallel resonance, Quality factor (Q), Bandwidth, Selectivity, Effect of Q on bandwidth and
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selectivity. Self-inductance, Mutual inductance, Dot conversion, Ideal Transformer.
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Practical:
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1. Determination of Resonance Frequency of Series & Parallel RLC Circuits.
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2. Transient analysis of RL and RC circuits.
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4. Linear Two-Port Network Analysis: Introduction to two-port networks, Characterization in
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terms of impedance, admittance, hybrid, and transmission parameters, parameter
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conversions, Interconnection of two-port networks – Symmetry and Reciprocity.
Practical:
1. Measurement of Impedance Parameters (Z-Parameters)
2. Explore the behavior of two interconnected two-port networks and verify the
principles of symmetry and reciprocity.
S.No Description
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Unit-I
Circuit Laws and Network Theorems
Introduction
- Foundation of electrical engineering
- Analyze and solve complex circuits
- Key concepts: voltage, current, power

Basic Concepts
- Voltage (V): potential difference
- Current (I): flow of charge
- Power (P): V × I
- Network terminology: node, branch, loop

Circuit Laws- Ohm's Law: V = IR
- Kirchhoff's Laws: KCL (current), KVL (voltage)

Circuit Analysis Techniques
- Mesh and Nodal Analysis
- Source transformation
- Star-delta transformation
- Thevenin's and Norton's theorems
- Superposition theorem
- Maximum power transfer theorem
- Reciprocity theorem
Basic Concepts
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- Voltage (V): potential difference
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- Current (I): flow of charge
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- Power (P): V × I
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- Network terminology:
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- Node: junction point
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- Branch: path between nodes
- Loop: closed path
- Short: zero resistance; Open: infinite resistance

Circuit Laws
- Ohm's Law: V = IR
- Kirchhoff's Laws:
- KCL: ΣI_in = ΣI_out
- KVL: ΣV_loop = 0

Components in Series/Parallel
- Resistors: R_series = R1 + R2; 1/R_parallel = 1/R1 + 1/R2
- Inductors: L_series = L1 + L2; 1/L_parallel = 1/L1 + 1/L2
- Capacitors: 1/C_series = 1/C1 + 1/C2; C_parallel = C1 + C2

Analysis Techniques
- Mesh and Nodal Analysis
- Source transformation
- Star-delta transformation
- Thevenin's and Norton's theorems
- Superposition theorem
- Maximum power transfer: R_L = R_th
- Reciprocity theorem
Two Marks QA
1. What is the difference between node and junction?
- Node: connection point; Junction: multiple elements meet.
2. Define short and open circuits.
- Short: zero resistance; Open: infinite resistance.

3. State Ohm's Law.
- V = IR.
4. What is KCL and KVL?
- KCL: ΣI_in = ΣI_out; KVL: ΣV_loop = 0.
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5. What is the equivalent resistance of resistors in series?
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- R_eq = R1 + R2 + ...
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6. How are capacitors connected in parallel?
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- C_eq = C1 + C2 + ...
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7. What is Thevenin's theorem?
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- V_th and R_th simplify complex circuits.
8. State Maximum Power Transfer theorem.
- R_L = R_th for max power.
9. What is Superposition theorem?
- Analyze circuits with multiple sources separately.
13 and 15 Marks QA
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Solution:
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