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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
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 terms 'direct current' and 'alternating current'?
Name some sources of direct current and some of alternating current.
State an important advantage of alternating current over direct current.
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.
The frequency of AC is _______.
Match the columns.
| Column A | Column B |
| 1) Direct current | a) Oscillatory |
| 2) Alternating current | b) Non oscillatory |
Right or wrong sentence.
The frequency of the alternating current is 50 Hz.
The frequency of electricity produced by DC generator is equal to ____________.
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:
Frequency
Answer the following questions based on the given graph.
- Identify which curve shows AC and DC.
- What is the frequency of AC and DC?
Why is an alternating current (A.C.) considered to be advantageous over direct current (D.C.) for the long distance transmission of electric power?
How is the type of current used in household supply different from the one given by a battery of dry cells?
