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Question
Distinguish between Direct current and alternating current.
Solution
| Direct current | Alternating current | |
| 1. | Magnitude of direct current from a source remains same. i.e., nonoscillatory. | Alternating current varies in magnitude continuously. i.e., oscillatory. |
| 2. | Direction remains same. | Direction reverses periodically, i.e., after equal intervals of time. |
| 3. | This type of current is not used much for household purposes but used in batteries, torches etc. | This type of current is used in electrical household appliances such as electric heater, refrigerator, electric iron, etc. |
| 4. | Frequency of D.C. is zero. | Frequency of A.C. in India is 50 Hz, i.e., its cycle changes in `1/50` second. |
| 5. | Produced by D.C. generator. | Produced by A.C. generator. |
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