Difference between Ac and DC

In this post i am sharing with you about for main Difference between Ac and DC Alternating Current and Direct current . In a close circuit , an electric current is the flow of free electrons . These are two kinds of electric current

1. Direct Current (DC):

A Direct Current has the following characteristics:

1.It flows in one direction only

2.It flows always from +ve terminal to -ve terminal of supply

3.It nay or may not have constant value and thus direct current may be :

(a) Steady D.C.

(b)Pulsating D.C.

Q . What is steady D.C. ( Direct. Current ).

Answer ➨ A direct current which has constant magnitude is called Steady D.C.

Q. What is Pulsating D.C. (Direct Current ).

Answer ➨ A Direct Current which changes the magnitude with the passage of time but flow in same direction is known as Pulsating D.C.

2. Alternating Current (A.C.)

An alternating current has the following characteristic :

1.It changes its direction regularly

2.It is also change it's magnitude with time

A.C. is supplied by A.C. Generators , and oscillators.

10 difference between A.C. and D.C.

Alternating Current (AC)	Direct Current (DC)
1. Alternating Current changes it's direction regularly	1.Direct Current flow in One Direction Only
2.The Magnitude of D.C Varies with Time	2.The Magnitude of A.C. does not Varies with Time
3. Alternating Voltage can be stepped up or stepped down easily	3.D.C. Supply can't be step up or step down easily
4.A.C. Power can be easily transmitted from one place to another place	4.D.C. Power at high voltage can not be easily transmitted from one place to another
5.In India frequency of A.C. is 50 HZ.	5.Frequency of D.C. is Zero
6.Skin effect occur in A.C. System. Hence Conductor resistance is increased	6.In D.C. System there is no skin effect occurs
7.A.C. Power can be generated at high Voltage. i.e. 11 K.V. & 33 K.V	7.D.C. Power can not be generated at high Voltage (Due to commutation problem )
8.In A.C. System voltage drop is comparatively	8.In D.C. System comparatively less voltage drop because in d.c. there is no effect of Inductive
9.In A.C. System at high voltage corona loss is large	9.In D.C. system ,at high voltage corona loss is small

In India supply frequency is 50 Hz and voltage is 230 V for single phase supply , 440 volts for 3 phase supply

in some countries like China, Japan, United State of America, the frequency of A.C. is 60 HZ. and supply voltage is 110 volt instead of 110v/230v.

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