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Actuators, in general,are devices that interact with external environment based on an input to generate a torque or a force. In a satellite, these are used on generate a torque.<br \>
The control law (think of it as an algorithm) does the job of coordinating sensor outputs with actuator inputs to obtain the desired attitude for the satellite. For instance, if magnetotorquer is the actuator then it decides how much current is to be supplied to it based on present attitude of satellite. <br \>
The important thing here is that we have this entire procedure going in a closed loop. The attitude is estimated once again and actuators are initiated yet again. <br \><br \>
Pic Courtesy: https://www.engineersgarage.com/contribution/experts/temperature-controlled-system <br \><br \>
If you are done reading this page, you can go back to [[Attitude Determination and Control Subsystem]]
