ESC - What is it?

[Inteliq]

Hi,

I would like to know what an ESC is and what is its function in a heli? Can a receiver be powered by the same battery that powers the main rotor?

[Artyspec]

ESC= Electronic Speed Controller, as its name suggests, it controls the speed of the motor...
YES if the ESC comes with built in BEC. (most are)