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CBSE Class 10 Answered

state the meaning of freequency of an alternating current .
mention its value in india 
why is an alternating current considered to be advantageous over direct current for long range transmission of electric energy ?explain 
Asked by Anirudh | 21 Sep, 2017, 06:12: PM
answered-by-expert Expert Answer
- The meaning of freequency of an alternating current : The number of times this current changes its poles alternatively. Frequency actually means the number of oscillations or vibrations or any regular movement. In AC the poles (+ and -) keeps changing regularly.
- The value of frequency of AC in India is 50 Hz i.e the poles changes from + to - and from - to + alternatively 50 times per second.
- Alternating current considered to be advantageous over direct current for long range transmission of electric energy because it minimizes the losses while transmission.
- Transmitting power over large distances requires you to choose a higher voltage level.
- Since DC did not have the capability of stepping up (increase) / stepping down (decrease) voltages until very recent times, AC was preferred.
Answered by Abhijeet Mishra | 21 Sep, 2017, 08:25: PM

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