Any externally introduced signal affecting the controlled output is called a
Right Answer is:
In engineering, control is usually restricted to only apply to those systems whose major function is to dynamically or actively command, direct or regulate. Control systems are made up of two main defining divisions that identify with the system, input, and output.
Input:- The input is the stimulus or excitation applied to a control system from an external energy source, usually in order to produce a specified response from the control system.
Output:- The output is the actual response obtained from a control system. It may or may not be equal to the specified response implied by the input. From these inputs and output, the Control System is formed.
Feedback:- Feedback is that property of a closed-loop system that permits the output (or some other controlled variable) to be compared with the input to the system (or input to some other internally situated component or subsystem) so that the appropriate controł action may be formed as some function of the output and input.
Error:- The difference between the input stimulus and the output response. Specifically, it is the difference between the input and the feedback.