Definitions :
Ohms Law:
Kirchhoff's current law (KCL)
At any node (junction) in an electrical circuit, the sum of currents flowing into that node is equal to the sum of currents flowing out of that node,
or:
The algebraic sum of currents in a network of conductors meeting at a point is zero.
or:
More simply, the sum of the emfs in any closed loop is equivalent to the sum of the potential drops in that loop.
or:
The algebraic sum of the products of the resistances of the conductors and the currents in them in a closed loop is equal to the total emf available in that loop.
Ohms Law:
The voltage across a resistor equals the resistance of the resistor times the current flowing through it (V = R* I).
Kirchhoff's current law (KCL)
At any node (junction) in an electrical circuit, the sum of currents flowing into that node is equal to the sum of currents flowing out of that node,
or:
The algebraic sum of currents in a network of conductors meeting at a point is zero.
Kirchhoff's voltage law (KVL)
The directed sum of the electrical potential differences (voltage) around any closed network is zero.or:
More simply, the sum of the emfs in any closed loop is equivalent to the sum of the potential drops in that loop.
or:
The algebraic sum of the products of the resistances of the conductors and the currents in them in a closed loop is equal to the total emf available in that loop.
BASICS IN COMMUNICATION:
A diode is a two-terminal device (thermionic diodes may also have one or two ancillary terminals for a heater).
Diodes have two active electrodes between which the signal of interest may flow, and most are used for their unidirectional electric current property.
- Voltage (V) :
- An electric field between two charges.
- Current (I):
- The drift of electrons in an electric field. This is perceived as a flow. It is measured in amperes.
- Current as 1) A.C, 2) D.C
- AC :
- Alternating current. Consists of a periodic oscillation between two
different voltages.
- DC :
- Direct current. A constant voltage and a constant current flow in one direction.
A diode is a two-terminal device (thermionic diodes may also have one or two ancillary terminals for a heater).
Diodes have two active electrodes between which the signal of interest may flow, and most are used for their unidirectional electric current property.
- Forward Biased :
- The voltage polarity through a part which causes it to conduct current.
- Reversed Biased :
- The inverted voltage polarity on a part.
Websites and useful links for basics in engineering:
1.http://en.wikibooks.org/wiki/Electronics/Definitions
2.http://electronics.indianetzone.com/
3.http://electronics.indianetzone.com/
Open Access Links
http://www.doaj.org
http://www.dli.ernet.in
http://www.plos.org/journals/index.html
http://www.intute.ac.uk/
http://journalseek.net/eng.htm
http://www.icast.org.in/ejournal/ejournal.php
http://lislinks.blogspot.com
http://bentham.org/open
NPTEL Video lectures and web courses
http://www.nptel.iitm.ac.in/
