actuator
Pronunciation:
/ˈæk.tjuː.eɪt.ə(ɹ)/noun
Definitions
Something that actuates something else, especially a usually electric device that causes a mechanical device (i.e. a mechanism) to be switched on or off, for example an electric motor that opens and closes a valve
Example: The mind is the actuator of the body.
The mechanism that moves the head assembly on a disk drive
A relay that controls the flow of electricity