Electrical Engineering ⇒ Topic : Basic Definitions
System: An arrangement or a combination of different physical components which are connected or related to one another to form an entire unit to achieve a certain objective is called a system.
A kite is an example of a physical system, because it is made up of paper and sticks. A classroom is an example of physical system.
Control: The meaning of control is to regulate, direct or command a system so that the desired objective is achieved.
Plant: It is defined as the portion of a system which is to be controlled or regulated.
Controller: It is the element of the system itself, or external to the system, and it controls the plant or the process.
Input: The applied signal or the excitation signal that is applied to a control system to get a specified output is called input.
Output: The actual response that is obtained from a control system after the application of input, is termed as output.
Disturbances: The signal that has adverse effect to the value of the output of a system is called disturbance. If a disturbance is produced within the system, it is termed as an internal disturbance.Otherwise, it is known as an external disturbance.
Control systems: It is an amalgamation of different physical elements linked in such a manner that it can regulate, direct or command itself to obtain a certain objective. A control system must have (1) input, (2) output, (3) ways to achieve input and output objectives, and (4) control action
Figure (a) shows the cause-and-effect relationship between the input and output.
Figure (a) Cause-and-effect relationship between the input and output of a plant.
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