Write one difference between direct current $(DC)$ and alternating current $(AC)$. Which one of the two is mostly produced at power stations in our country? Name one device which provides alternating current. State one important advantage of using alternating current.

(N/A) $DC$ does not change its direction with time,whereas $AC$ reverses its direction periodically.
Most power stations in India produce $AC$.
An $AC$ generator is a device that produces alternating current.
One important advantage of using $AC$ is that electric power can be transmitted over long distances without much loss of energy.