Elements of Electrical Engineering
The following topics are covered: Network Terminology and basic concepts. Concept of ideal sources, Kirchhoff’s laws, Voltage and Current Division Rules, concept of short circuit and open circuit, Practical Sources and source transformation.
Star Delta transfo...
Produce
enesefy consume/ store eneeisy
current leaves the terminal current enters tvetelnrinal
IN
Eg sources
Eg :L C R
:
, ,
Network : connection of electrical elements
Circuit : Electrical network comprising of at least one source and /sink , having a closed path
for current flow .
current :
Amp or coulumblsec
potential difference : Volt V3 or Joule / coulomb .
power : watts @ ) or volt * amp .
resistance : ohms @) or volt/ amp
ifs
.
-
o resistivity
:
ohm -
m
conductivity :
Siemens
OHM 'S LAW :
VXI
f- IR Ris constant of proportionality .
CR -
resistance]
A- s -
resistivity tp=G G- conductivity .
KIRCHOFF 'S LAWS :
1. Cueeent law :
sum
of cuhhonts is zero at node
of electric network
every an .
ER)
aultenb is to
sum
of incoming equal sum
of outgoing currents .
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7
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eIzTI3= 24
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