Basic Definitions of Electrical Engineering

Electric charge of electrons


Electric Charge

Electric charge, basic property of matter carried by some elementary particles. Electric charge, which can be positive or negative, occurs in discrete natural units and is neither created nor destroyed.

Current.

Current  is  defined  As  current  motion  involving  charge  via a  conducting material.  The unit  involving  current  will be  ampere  while  charge  will be  measured  throughout  Coulombs. 
It can also be described as movement of electricity along a conductor. 

ac and dc current

Direct Current  (D.C.)       

Direct  current or constant current  is actually   many  commonly found  throughout  homes  in the   application   regarding  electrical energy  kept   inside  batteries.  with   a great  DC circuit,  The sort of  voltage  along with the  direction  of   application   are generally  constant.  The level of  voltage  is usually  determined  through the  type  in  addition to  size  regarding  battery.  ones  direction  involving  current flow  is   additionally  constant and,  Just as   inside  AC circuits,  The sort of  current flow  is  determined  by the   fill up  resistance.
 Batteries convert chemical energy  to  electrical energy.  chemical energy  is actually   within  wet form,  Equally   Utilizing your  car battery,  as well as   within  dry  application   Equally   in  flashlight  in addition to  transistor-radio batteries.  several  batteries  are generally   made to   possibly be  recharged  via   a  AC source. Voltage  via   almost all  batteries, unless recharged,  will  gradually decrease. AC power  is actually  converted  for you to  DC power  pertaining to   a few   functionalities   for the  home. Your own  conversion  is actually   done   by   a good  device called  the  rectifier  or perhaps  current converter.
flow of current ac and dc

Alternative Current. (A.C.)

 Alternative current or time varying current can be defined as a   flow  of  electrons  that will  reverses  it is  direction  involving  flow  at  regular intervals  with   the  conductor.      

Ampere.

The basic SI unit of  measuring the quantity of electricity.
      The  range   connected with   whole  charge  The item  passes  in the course of   a great  arbitrary cross  section   of a  conducting material per unit second  will be  defined  just as one  Ampere.    
Mathematically
                                      I = Q/t  or Q = I.t
Where 
Q is symbol of charge in coulombs,(C)
I is the current in amperes (A)  
t is the time in second (s)

Voltage or Potential difference.

        Voltage attempts  to   Produce a  current flow,  as well as current  may  flow  no matter whether   ones  circuit  can be  complete. Voltage  will be  sometimes  stated  just like   the  'push'  or  'force'  of   electricity, it isn't really a force but this may help you to imagine what is happening. It is possible to have voltage without current, but current cannot flow without voltage.

Volt

A unit  involving  electrical pressure (or electromotive force)  of which  causes current  to be able to  flow  with   the  circuit.  individual  volt  is usually   The level of  pressure  necessary to  cause  one  ampere  of  current  to be able to  flow against  one  ohm  regarding  resistance.   

Watt.

  A unit  involving  measure  with regard to  indicating  ones  electrical power applied  with   a great  circuit.  This really is   taken   coming from  multiplying  the current  (in amperes)  by the  electrical pressure (in volts)  in which  cause  That   for you to  flow.  watts = amperes x volts. 

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