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प्रश्न
Distinguish between Direct current and alternating current.
Write any two differences between direct current and an alternating current.
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उत्तर
| Direct current | Alternating current | |
| 1. | Magnitude of direct current from a source remains the same. i.e., nonoscillatory. | Alternating current varies in magnitude continuously. i.e., oscillatory. |
| 2. | Direction remains the 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, refrigerators, electric irons, 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. |
Notes
Students should refer to the answer according to their questions.
संबंधित प्रश्न
What type of current is given by a dry cell?
In what respect does the construction of an A.C. generator differ from that of a D.C. generator?
What normally drivers the alternators in a Thermal Power Station? What fuels can be used to heat eater in the boiler?
What do you understand by the term ‘direct current’?
State an important advantage of alternating current over direct current.
What is the frequency of A.C. supply in India?
The frequency of direct current (d.c.) is:
(a) 0 Hz
(b) 50 Hz
(c) 60 Hz
(d) 100 H
Explain ‘Electric generator’ with the help of the following points:
- Diagram of an AC Generator with labelling
- Principle of an electric generator
- The function of slip rings
- Any two uses of a generator.
State an important advantage of using alternating current (a.c.) over direct current (d.c.).
Alternating current : oscillatory :: Direct current : _______
Match the columns.
| Column A | Column B |
| 1) Direct current | a) Oscillatory |
| 2) Alternating current | b) Non oscillatory |
The alternating current is an oscillatory current.
Right or wrong sentence.
The frequency of the alternating current is 50 Hz.
The domestic electricity in India is an ac with a frequency ______ of Hz.
What is the role of fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?
The device used to convert AC to DC is called ______.
Define the following:
Rectifier
