why is alternating current preferred over direct current List any three reasons
Answers
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
From power stations, AC is produced so it is better to use AC than DC instead of converting it.
When a large fault occurs in a network, it is easier to interrupt in an AC system, as the sine wave current will naturally tend to zero at some point making the current easier to interrupt.
It is easier to convert AC to DC rather than the other way around.
AC can be stepped up and back down with transformers quite easily whereas DC cannot as transformers rely on a constantly changing EMF(electromotive force).
If the DC was left at the supply voltage over a very large distance the volt drop would be too great and the wires would have to be enormously thick (and expensive) in order to carry the required current.
Modern technology has brought about ways to step up voltage of DC with solid state circuitry and is becoming a possibility for the future, but it is still expensive and not quite as efficient or reliable as the good old transformer.
Consumer’s Perspective:
All the household and indstrial systems are wired for AC rather than DC. It would be highly impractical to convert every equipment to DC.
Fairly high voltage DC can be quite dangerous, if you were to grab a wire with damaged insulation it becomes very hard to release the hand from it as the muscles clamp up tight.
This isn't to say that grabbing an AC bare wire would be any good for you either but you have more of a chance of releasing yourself from it.
I hope it helps. If doesn’t, feel free to ask.
due to the reason that it chages direction every sec...
in India the speed of AC current is 50 hertz that is it changes direction every 1 by 100 of a sec
2) less loss of energy3) Due to the reason that it can be stepped up and down using transformers.4) AC current can be converted to DCeasily