An electronic speed control (ESC) is an electronic circuit that controls and regulates the speed of an electric motor. It may also provide reversing of the motor and dynamic braking.
Miniature electronic speed controls are used in electrically powered radio controlled models. Full-size electric vehicles also have systems to control the speed of their drive motors.
A generic ESC module rated at 35 amperes with an integrated eliminator circuit
Drone
A radio-controlled model is a model that is steerable with the use of radio control (RC). All types of model vehicles have had RC systems installed in them, including ground vehicles, boats, planes, helicopters and even submarines and scale railway locomotives.
1:10 scale radio-controlled car (Saab Sonett II)
The 'Shumacher S.S.T.2000' RC Car. Shown here without the body kit or battery pack installed to allow for a clearer view of a hobby grade car.
Image: Tesla boat 1
Image: Dc motor and controller