Question

and why is AC preferred over DC for long range transmission of electric power ?

Answer 1

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Because of AC systems are preferred over DC systems: a. It is easy to maintain and change the voltage of AC electricity for transmission and distribution. Plant cost for AC transmission (circuit breakers, transformers etc) is much lower than the equivalent DC transmission c.


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Answer 2

AC is preffered over DC for long range transmission of electrical power because increasing in distance DC electric power does decrease and AC electric power remains same.