Direct Current (DC):
An electronic current flowing in one direction only is known to be direct current. DC is produced by sources such as batteries, power supplies, thermocouples, solar cells, or dynamos. DC may flow in a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vaccum as in electron or ion beams.
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Alternating Current (AC):
An electric current that reverses its direction many times a second at regular intervals, typically used in power supplies. AC is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions and electric lamps into a wall socket.
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Differences between AC and DC:
AC |
DC |
| AC is defined as the flow of charge that changes direction periodically. | In a DC circuit, electrons emerge from the minus or negative pole and move towards the positive pole. |
| It is safe to transfer over longer city distances and will provide more power. | Practically the voltage of DC cannot travel very far until it begins to lose energy. |
| It is denoted rotating magnet along the wire. | It is denoted steady magnetism along the wire. |
| The frequency of AC will be either 50Hz or 60Hz depending upon the country. | The frequency of direct current will be zero. |
| It reverses its direction while flowing in a circuit. | It only flows in one direction in the circuit. |
| It is the current of magnitude which is varying with time. | It is the current of constant magnitude. |