The electrical energy is available in two forms
(1) Direct Current (DC)
(2) Alternate Current (AC)
(1) Direct Current (DC) :-
The direct current is that current which do not changes its direction, It always flows in one direction from positive terminal to negative terminal of the source.
Applications of Direct Current
(i) Battery charging
(ii) Telephone Systems
(iii)Electronic equipments
(iv) D.C. drives and traction purposes
(v) Electroplating
(vi) Operation of protective relays
(vii) Transmitters and radio sets etc.
(2) Alternating Current (AC) :-
Current or voltage which changes its magnitude and direction with time regularly is known as alternating current.
An alternating current can also be defined as that which changes its magnitude tn one direction from zero to maximum, returned to zero and then going through sunilar vanations but in opposite direction.
Applications of Alternating Current
(i) A.C: is used for household applications such. as electric tubes, bulbs, heaters, refrigerators, fans, mixer, food-processors etc.
(ii) A.C. is used in industries for running a.c. motors and drives.
(iii) A.C. is used to operate mixers, vibrators, lifts, drills, tube-wells etc.
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