Discussion
In a control system the output of the controller is given to :
Answer: A
The output of the controller is given to the final control element.
In a feedback loop the sensor measures the controlled variable, the comparator forms the error between it and the set point, and the controller processes that error into a corrective signal. That signal drives the final control element, for example a control valve, a motor drive or a heater, which acts directly on the process to change the controlled variable.
The comparator and sensor come before the controller in the signal path, so its output is not fed to them. An amplifier may be part of the controller or of the actuator, but the block the controller's output is defined as feeding is the final control element.
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