Mechanical speed controllers use a network of resistors and switch between them by rotating a head with an electrode around a plate that has electrical contacts. Mechanical speed controllers are prone to being slow to react, waste energy in the form of heat from the resistors, and can become dirty and perform intermittently.
Electronic speed controllers use solid state components to regulate the power delivered to the electrical motor. Most electronic speed controllers use the electric motor as a magnetic brake, offering better control of the vehicle than is possible with a mechanical speed control.
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