Answer / er. sanjana singh

ac current is flow in alternating nature & it have frequency.
dc current is direct current and flow in straight direction & dc current has no frequency..

Answer / sureshkumar

ac current has skin effect,corona losses and dc current does not having skin effect,corona in transmission lines 


ac transmission can change voltage levels by using step-up transformers and in dc it is not possible

Answer / sureshkumar

in ac we can change voltage levels by using power transformers 
and in dc can not change voltage levels because we not using power transformers

Answer / syamkumar

ac current changes it's magnitudeand it has frequency but
dc cureent doesn't changes it's magnitude and it didn't
have frequency.

selection of conductor in different voltage?

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