Question

Differentiate ac and dc briefly.

Answer 1

Alternating Current Direct Current
Amount of energy that can be carriedSafe 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 electronsRotating magnet along the wire.Steady magnetism along the wire.FrequencyThe frequency of alternating current is 50Hz or 60Hz depending upon the country.The frequency of direct current is zero.DirectionIt reverses its direction while flowing in a circuit.It flows in one direction in the circuit.CurrentIt is the current of magnitude varying with timeIt is the current of constant magnitude.Flow of ElectronsElectrons keep switching directions - forward and backward.Electrons move steadily in one direction or 'forward'.Obtained fromA.C Generator and mains.Cell or Battery.Passive ParametersImpedance.Resistance onlyPower FactorLies between 0 & 1.it is always 1.TypesSinusoidal, Trapezoidal, Triangular, Square.Pure and pulsating.

Answer 2

In direct current (DC), the electric charge (current) only flows in one direction. Electric charge in alternating current (AC), on the other hand, changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction.
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