# Introduction to Electrical Engineering (BESCK104B)

## Introduction to Electrical Engineering

### Module-1

Introduction:Conventional and non-conventional energy resources; General structure of electricalpower systems using single line diagram approach.

Power Generation: Hydel, Nuclear, Solar & wind power generation (Block Diagram approach).

DC Circuits:Ohm’s Law and its limitations. KCL & KVL, series, parallel, series-parallel circuits.Simple Numerical.

### Module-2

A.C. Fundamentals:Equation of AC Voltage and current, waveform, time period, frequency, amplitude, phase, phase difference, average value, RMS value, form factor, peak factor. (only definitions) Voltage and current relationship with phasor diagrams in R, L, and C circuits. Concept of Impedance.Analysis of R-L, R-C, R-L-C Series circuits.Active power, reactive power and apparent power.Concept of power factor. (Simple Numerical).

Three Phase Circuits:Generation of Three phase AC quantity, advantages and limitations; star and delta connection,relationship between line and phase quantities (excluding proof)

### Module-3

DC Machines: DC Generator: Principle of operation, constructional details, induced emf expression, types of generators.Relation between induced emf and terminal voltage.Simple numerical.

DC Motor: Principle of operation, back emf and its significance. Torque equation, types of motors,characteristics and speed control (armature & field)of DC motors(series & shunt only). Applications of DC motors. Simple numerical.

### Module-4

Transformers: Necessity of transformer, principle of operation, Types and construction of singlephase transformers, EMF equation, losses, variation of losses with respect to load. Efficiency and simple numerical.

Three-phase induction Motors: Concept of rotating magnetic field, Principle of operation,constructional features of motor, types – squirrel cage and wound rotor. Slip and its significance simple numerical.

### Module-5

Domestic Wiring: Requirements, Types of wiring: casing, capping.Two way and three way control of load.

Electricity Bill: Power rating of household appliances including air conditioners, PCs, laptops,printers, etc. Definition of “unit” used for consumption of electrical energy, two-part electricity tariff,calculation of electricity bill for domestic consumers.Equipment Safety measures: Working principle of Fuse and Miniature circuit breaker (MCB),merits and demerits.

Personal safety measures: Electric Shock, Earthing and its types, Safety Precautions to avoid shock.

#### Suggested Learning Resources:

Text Books:

1. Basic Electrical Engineering by D C Kulshreshtha, Tata McGraw Hill, First Edition 2019.

2. A text book of Electrical Technology by B.L. Theraja, S Chand and Company, reprint edition 2014.

Reference Books:

1. Basic Electrical Engineering, D. P. Kothari and I. J. Nagrath, Tata McGraw Hill 4th edition, 2019.

2. Principles of Electrical Engineering & Electronics by V. K. Mehta, Rohit Mehta, S. Chand and CompanyPublications, 2nd edition, 2015.

3. Fundamentals of Electrical Engineering by Rajendra Prasad, PHI, 3rd edition, 2014.

Web links and Video Lectures (e-Resources):

 www.nptel.ac.in