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CBSE - X - Physics - Magnetic Effects of Electric Current

sry its just by question is what is AC and DC ?

Asked by jp 19th September 2013, 2:44 PM
Answered by Expert


Comparison chart

 Alternating CurrentDirect 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 constantmagnitude.
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.
Answered by Expert 19th September 2013, 7:41 PM

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