# Describe the difference between direct and alternating current.

Describe the difference between direct and alternating current.

 Particulars Direct Current Alternating Current 1. Waveform 2. Definition It is the current whose magnitude and direction do not change with respect to time. It is the current whose magnitude and direction continuously changes with respect to time. 3. Use of transformer Not possible Possible 4. Design of machines Complicated Simple 5. Frequency Zero It is 50 Hz or 60 Hz depending upon country. 6. Obtained from Battery, Cell and DC Generator Alternator 7. Passive parameters Resistance only Resistance, Inductance, Capacitance. 8. Applications DC machines, HVDC system, electroplating, Battery charging, Traction. AC machines, Domestic and industrial supply.
 Point AC Supply DC Supply 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 Types Sinusoidal, Trapezoidal, Triangular, Square. Pure and pulsating.

DC vs AC

Direct current is the flow of electricity or charge in one direction..

Alternative current is the flow of charge that doesn't flow in one direction.
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