Check sibling questions

(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.

DIRECT CURRENT FLOW - Teachoo.jpg

ALTERNATING CURRENT FLOW - Teachoo.jpg

(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 .

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CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo