|Fig: Alternating Current|
When we plug some electrical equipment to the Wall Socket, what is happening?
What the Power Houses are selling to us?
Are they selling electrons or just Energy?
The type of current that is provided by generators is called alternating current(ac).
So in general, the Power Stations sell energy to us not electrons. We supply the electrons.
Look at the animation on the right and notice how the electrons do not move in any particular direction but move to and fro about a fixed point.