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Automatic control is the research area and theoretical base for mechanization and automation, employing methods from mathematics and engineering. A central concept is that of the system which is to be controlled, such as a rudder, propeller or an entire ballistic missile. The systems studied within automatic control are mostly the linear systems.

Automatic control systems are composed of three components:

Sensor(s), which measure some physical state such as temperature or liquid level.
Responder (s), which may be simple electrical or mechanical systems or complex special purpose digital controllers or general purpose computers.
Actuator(s), which effect a response to the sensor(s) under the command of the responder, for example, by controlling a gas flow to a burner in a heating system or electricity to a motor in a refrigerator or pump.

A regulator such as a thermostat is a typical example of a device studied in automatic control.

Topics: Automatic Control, Automatic Dependent Surveillance Broadcast...

Automatic Dependent Surveillance-BroadcastAutomatic Dependent Surveillance-Broadcast (also called ADS-B) is a system by which airplanes constantly broadcast their current location, speed, flight plan, size and type of craft, and other information. This information is received by other airplanes a	Automatic number announcement circuitAn automatic number announcement circuit (ANAC is a special telephone number that is meant to be used by phone company technicians and other telecommunications technicians to determine the phone number of a particular line. The way an ANAC works is fairly	Automatic callbackIn telecommunication, an automatic callback is a service feature that permits a user, when encountering a busy condition, to instruct the system to retain the called and calling numbers and to establish the call when there is an available line. Note 1: Au
Automatic call distributorThis article is about automatic call distributors. For other uses of the term ACD see ACD (disambiguation . In telephony, an Automatic Call Distributor ACD is a device that distributes incoming calls to a specific group of terminals that agents use. ACD s	Automatic callingAutomatic calling Calling in which the elements of the selection signal are entered into the data network contiguously at the full data signaling rate. The selection signal is generated by the data terminal equipment. A limit may be imposed by the design	Automatic data processingIn telecommunication, the term automatic data processing (ADP) has the following meanings: 1. An interacting assembly of procedures, processes, methods, personnel, and equipment to perform automatically a series of data processing operations on data.
Automatic data processing equipment	Automatic link establishment	Automatic message exchange
Automatic redial	Automatic sounding	Automatic switching system
Automatic teller machine	Automatic baud rate detection	Automatic squeeze

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