Page 100 - Basic Electrical Engineering

2

DC Networks and Network Theorems

TOPICS DISCUSSED

Circuit and circuit elements
Voltage and current sources
Series and parallel circuits; Kirchhoff’s laws
Superposition theorem
Thevenin’s theorem
Norton’s theorem
Millman’s theorem
Maximum power transfer theorem
Star-delta transformation of resistances
Transients in R–L and R–C circuits

2.1 INTRODUCTION

A network is an interconnection of elements, components, input signals, and
output signals. The networks are of two types, viz active network and passive

network. An active network contains one or more sources of supply whereas
a passive network does not contain any source of supply voltage or current.

There are three basic components of a circuit or a network, viz resistor,
capacitor, and inductor. Energy received by these components are either
dissipated or stored in them. For example, energy dissipated in a resistor is