| (1) An alternating current reverses periodically and its magnitude changes. | (1) Direct current flows only in one direction and remains unaltered. |
| (2) Amplitude and polarities are varying continuously. | (2) Amplitude and polarities are fixed. |
| (3) It has a particular frequency. | (3) It is independent of frequency. |
| (4) AC can be generated at higher voltages. | (4) DC cannot be generated at high voltages because of commutation difficulties. |
| (5) In case of AC, the cost of generation is less. | (5) In case of DC, the cost of generation is more. |
| (6) Alternating voltage can be increased (stepped up or decreased (stepped down) easily with the helpof a transformer. | (6) Direction voltage cannot be increased or decreased easily. |
| (7) AC motors are of less cost, more robust, and durable. | (7) DC motors are costly and less durable. |
| (8) The maintenance cost of AC equipment andappliances is less. | (8) The maintenance cost of DC equipment and appliances is more. |
| (9) AC cannot be used directly for electroplating. | (9) Only DC can be used directly for electroplating. |
| (10) The speed of AC motors cannot be controlled easily. | (10) The speed control of DC motor is very easy and economical. |
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