Question

what is the main difference between direct current and alternating current ?how many times does AC used in India change direction in one second?​

Answer 1

the AC is vary with time but DC is constant with time.
and the frequency of AC in India is 50hz

Answer 2

Comparison chart

Alternating Current versus Direct Current comparison chart

Alternating Current Direct Current

Amount of energy that can be carried Safe to transfer over longer city distances and can provide more power. Voltage of DC cannot travel very far until it begins to lose energy.

Cause of the direction of flow of electrons Rotating magnet along the wire. Steady magnetism along the wire.

Frequency The frequency of alternating current is 50Hz or 60Hz depending upon the country. The frequency of direct current is zero.

Direction It reverses its direction while flowing in a circuit. It flows in one direction in the circuit.

Current It is the current of magnitude varying with time It is the current of constant magnitude.

Flow of Electrons Electrons keep switching directions - forward and backward. Electrons move steadily in one direction or 'forward'.

Obtained from A.C Generator and mains. Cell or Battery.

Passive Parameters Impedance. Resistance only

Power Factor Lies between 0 & 1. it is always 1.

Types Sinusoidal, Trapezoidal, Triangular, Square. Pure and pulsating.