(i) What is meant by the terms alternating current and direct current?
(ii) Name a source of alternating current and a source of direct current.
(iii) Mention the frequency of AC supply in India.
(iv) State two important advantages of alternating current over direct current.
Answer:
(i)
|
Direct Current |
Alternating Current |
|
If current flows only in one direction , it is direct current. |
Alternate current reverses direction in equal intervals of time. |
(ii)
- Source of direct current: electric cell
- Source of alternating current: electric generator
(iii)The frequency of AC supply in India is 50Hz.
(iv)Advantages of alternating current (AC) over direct current (DC):
- AC can be transmitted over long distances without much loss of energy.
- Generating AC is easy and economical.
- Easy to convert into DC .
