Question

state differnace and advantange of AC and DC​

Answer 1

different between ac and dc
ac= alternative current
dc= direct current

ac is indicated by wave
and
dc is also indicated by straight line

AC is "changing directions"
and
DC has a "steady flow" of electrons in one direction may be a little difficult for a layman or a beginner with electronics or electricals to understand.

In simple words AC has frequency, that is it is switching on and off. In India the mains supply is described as 220v AC, 50Hz. Voltage is the potential difference and frequency are the no. of oscillations per second.  This means the potential difference is 220v and the supply is switching on and off 50 times very second


In DC there is no frequency it is a continuos flow. DC is simply stated as 12v DC, 6v DC etc. Have we ever heard 12v DC 20Hz.  or 6v DC 50Hz. never.







Advantage and disadvantage of AC over dc
ADVANTAGES

The generation of A.C. is cheaper than that of D.C.

A.C. machines are simple , robust and do mot require much attention for their repairs and maintainance during their use.

Wide range of voltages are obtained by the use of transformer.

The magnitude of current can be reduced by using an inductance or a conductor without any appreciable loss of energy

A.C. can easily be converted into D.C. with the help of rectifiers.

When A.C. is supplied at higher voltages in long distance transmission , the line losses are small compared to a D.C. transmission

DISADVANTAGES

Peak value of A.C. is high and it is dangerous to use so better insulation is required.

It attracts person who touches it unlike D.C. which gives a repelling shock.

An A.C. is transmitted from surface of the conductor and hence need several strands of thin wires insulated from each other.