why does electric current flow the moment when swithch is on

Throw a switch on the wall and light will flood the room. Click the power button on your TV remote and sound and pictures appear. Electricity controls your heating and air conditioning as well as the rest of your world.

How does it work? How does it get to your light? Notice some things right off about electrical current flow. It’s fast, nearly instantaneous. Also, the current that began flowing the moment you closed that switch was just produced by the generator of the power station perhaps hundreds of miles away. Electricity cannot be stored; it must be generated as needed.