IVC
FIRST YEAR
Electrical Wiring and Servicing of
Electrical Appliances / Electrical
Engineering Technician
ELEMENTS
OF
ELECTRICAL
ENGINEERING
STATE INSTITUTE OF VOCATIONAL EDUCATION
DIRECTOR OF INTERMEDIATE EDUCATION
GOVT. OF ANDHRA PRADESH
Telugu Academy Publication : Vocational Course - fyctec
INTERMEDIATE
VOCATIONAL COURSE
FIRST YEAR
ELEMENTS OF ELECTRICAL
ENGINEERING
FOR THE COURSE OF
ELELCTRICAL WIRING AND SERVICING OF
ELECTRICAL APPLIANCES / ELECTRICAL
ENGINEERING TECHNICIAN
STATE INSTITUTE OF VOCATIONAL EDUCATION
DIRECTOR OF INTERMEDIATE EDUCATION
GOVT. OF ANDHRA PRADESH
2005
Intermediate Vocatioinal Course, 1st Year
ELEMENTS OF ELECTRICAL
ENGINEERING
(For the Course of E.W. & S.E.A. / E.E.T.)
Author
Sri. Lt. K. PRASAD PEM&M
Junior Lecturer, EWSEA,
Govt. Jr. College, Falaknuma, Hyd - 53.
Editor
Sri. M. PAUL PRASAD B.E. (Ele),
Junior Lecturer, EWSEA,
Govt. Jr. College, Falaknuma, Hyd - 53.
Price : Rs. /-
Printed in India
Laser Typeset Reformatted by SINDOOR GRAPHICS, Dilsukhnagar, Hyderabad-60.
Phone : 24047464, 9393009995
CONTENTS
S.No.
Chapter Name
Page No.s
1.
Magnetism
1-20
2.
Electrical Current - Ohm’s Law Kirchoff’s Law
21-53
3.
Units of work, power and energy
54-68
4.
Effects of electric current
69-103
5.
Electro magnetic induction
104-115
6.
Fundamentals of Alternating currents
116-124
1
Magnetism
1 MAGNETISM
Magnets :
1.1 Introduction :
Magnet is the substance which attracts magnetic mterial such as iron,
nikel, coblat steel, manganese etc.
The magnetic properties of materials were known from ancient times. A
mineral discoverd around 800 B.C. in the town of Magnesia was found to have
a wondrous property. It could attract pieces of iron towards it. This mineral is
called Magnetite after the place where it was discovered. Further, it was found
that thin strips of magnetitie always align themselves in particular direction when
suspended freely in air. For this property, it was given the name ‘ Leading
Stone’ or ‘Lead stone’. Later, it was found that magnetite is mainly composed
of o