Question

a) What is meant by the terms alternating current and direct current?
(b) Name source of alternating current and a source of direct current
(c) Mention the frequency of AC supply in India.
(d) State two important advantages of alternating current over direct current.


CBSE Class X Science LA (5 Marks)

Answer 1

(a) Alternating current is an electric current that reverses its direction many times a second at regular intervals, while direct current is the unidirectional flow or movement of electric charge carriers.
 
(b) Source of AC current — electric generator. Source of DC current — electric cell.
 
(c) Frequency of alternating current in India is 50 Hz.

(d) (i) Alternating current reverses its direction periodically but direct current always flow in one direction.
 (ii) AC electric power can be transmitted over long distances without much less of energy while DC not

Answer 2

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