Define open loop control.

Open loop control refers to a control system that operates without feedback. In this type of system, the controller sends a command to the actuator or process based on a predetermined setting or input, and does not take the output into account for making adjustments. This means that once the command is given, the system does not check whether the desired result has been achieved, nor does it adjust its actions based on the feedback received.

For example, a simple heating system that turns on for a set period without any sensors to check if the desired temperature has been reached exemplifies open loop control. The lack of feedback can make open loop systems simpler and often less expensive to design and implement, but it can also lead to inefficiencies if conditions change or if the system's performance varies from expectation.

In contrast to open loop control, systems with feedback (closed loop control) evaluate the output and adjust the input accordingly to achieve the desired performance. Hence, knowing the distinction between these two types of control systems is essential in mastering control theories.