Electromagnetic clutches can be used when mechanical sympathy and timing of clutch operation is generally disregarded, with the clutch being actuated by a simple button press on the gearstick or even a proximity sensor when your hand is near the gearstick. When the clutch is actuated remotely, a DC current passes through an electromagnet which produces a magnetic field. The armature is then attracted to a rotor, creating a frictional force to engage the engine and transmission.