In a control loop, what is the role of feedback?

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Multiple Choice

In a control loop, what is the role of feedback?

Feedback in a control loop is the mechanism that compares the actual output to the setpoint and uses that information to adjust the input to minimize error. By measuring where the system actually ends up, the controller generates an error signal—the difference between where you want to be and where you are. The controller then acts on that error to change the actuator input, bringing the output toward the setpoint and compensating for disturbances like changes in load or friction. Without this measurement-and-correct process, the system would drift away from the desired value. The other ideas describe actions that aren’t how feedback functions: storing energy, amplifying a signal without considering the output, or simply changing the supply voltage.

Feedback in a control loop is the mechanism that compares the actual output to the setpoint and uses that information to adjust the input to minimize error. By measuring where the system actually ends up, the controller generates an error signal—the difference between where you want to be and where you are. The controller then acts on that error to change the actuator input, bringing the output toward the setpoint and compensating for disturbances like changes in load or friction. Without this measurement-and-correct process, the system would drift away from the desired value. The other ideas describe actions that aren’t how feedback functions: storing energy, amplifying a signal without considering the output, or simply changing the supply voltage.

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