Electromotor have two lines of stand and brakes The Brak topic is not much very important for engine, for example, the motor of an industrial fan may be rotating and then stand still for a minute after a power failure. But an elevator motor must stop at the exact point which reveals the importance of brake in electric motors.
Rheostat are needed for many industrial or laboratory applications such as (Current Control Box) in cathodic protection systems or laboratory testing desk in manufacturing firms and universities.
