13. Which of the following is the primary advantage of an alternating current (AC) over direct current (DC) ?
(a) What do you understand by the terms 'direct current' and 'alternating current' ?
(b) Name some sources of direct current and some of alternating current.
(c) Stated an important advantage of alternating current over direct current.
(d) What is the frequency of A.C. supply in India ?
What is the advantages of AC current over DC current ?