||The current which changes magnitude and polarity is called alternating current.
||The current which does not change magnitude and polarity is called direct current.
||It is produced by AC generator, dynamo, etc.
||It is produced by cells, battery, DC generator, etc.
||It can be used in transformer to increase or decrease the voltage.
||It cannot be used in transformer.
||It has non zero frequency.
||It has zero frequency.
||It is denoted by AC.
||It is denoted by DC.
||It can provide more power and is safe to transfer over longer city distances.
||Voltage of DC cannot travel very far until it begins to lose energy.
||Rotating magnet along the wire is the cause of the direction of flow of electrons.
||Steady magnetism along the wire is the cause of the direction of flow of electrons.
||Electrons keep switching directions- forward and backward.
||Electrons move steadily in one direction or forward.
||Power factor lies between 0 and 1.
||Power factor is always 1.
||Passive parameters are impedance.
||Passive parameter is resistance only.
||It is of sinusoidal, trapezoidal, triangular, square types.
||It is pure and pulsating types.
Image source: extremelow
Differences between alternating and direct current