Electricity
AC: An electric current whose magnitude changes with time and direction reveres periodically is called alternating current.
It is denoted by AC.
Source of AC are hydro-electric generators, thermal power generations and nuclear power generators etc.
The number of cycles completed by the AC in one second is called the frequency of AC.
The frequency of AC in India is 50 Hz.
Frequency 50 Hz means that AC changes its directions after 1/100 second.
DC: An electric current whose magnitude is either constant or variable but the direction remains the same is called Direct current.
It is denoted by DC.
Sources of DC are voltaic cell, a dry cell, battery, DC generators etc.
MAJOR DIFFERENCE BETWEEN AC AND DC:
AC: Alternate Current
AC reverses its direction periodically.
Electric power can be transmitted over long distances without much loss of energy.
Alternating voltages can be stepped up or stepped down as per requirement, using transformer.
DC: Direct Current
always flow in one direction.
Ashwani Kumar
ashwanikmr82@gmail.com
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