Control system ak jairath pdf

What is a feedback control system?
In feedback control, the variable being controlled is measured and compared with a target value.
This difference between the actual and desired value is called the error.
Feedback control manipulates an input to the system to minimize this error..
Gain is a proportional value that shows the relationship between the magnitude of the input to the magnitude of the output signal at steady state.
Many systems contain a method by which the gain can be altered, providing more or less "power" to the system.

What is a feedback control system?