Question

Q. 13. Write three differences between direct current and alternating current
3 Marks
OR
State the Principle of an electric generator​

Answer 1

Answer:

1.

Alternative Current:

• AC is safe to transfer longer distance even between two cities, and maintain the electric power.
• The rotating magnets cause the change in direction of electric flow.
• The frequency of AC is depended upon the country. But, generally, the frequency is 50 Hz or 60 Hz.

Direct Current:

• DC cannot travel for a very long distance. It loses electric power.
• The steady magnetism makes DC flow in a single direction.
• DC has no frequency of zero frequency.

2.

Electric generators work on the principle of electromagnetic induction. A conductor coil (a copper coil tightly wound onto a metal core) is rotated rapidly between the poles of a horseshoe type magnet. ... The magnetic field will interfere with the electrons in the conductor to induce a flow of electric current inside it.

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