Closed loop may refer to:
- A feedback loop, often found in:
- Closed-loop transfer function, where a closed-loop controller may be used
- Electronic feedback loops in electronic circuits
- PID controller, a commonly used closed-loop controller
- Closed ecological system not relying on matter exchange outside of the system, as opposed to open loop
- Ecological sanitation systems or ecosan, intended to close the nutrient and water cycle
- Pulling water from one area of a reef aquarium and pumping it immediately elsewhere in the tank to create higher flow and minimize dead spots
Famous quotes containing the word closed:
“Alas for the cripple Practice when it seeks to come up with the bird Theory, which flies before it. Try your design on the best school. The scholars are of all ages and temperaments and capacities. It is difficult to class them, some are too young, some are slow, some perverse. Each requires so much consideration, that the morning hope of the teacher, of a day of love and progress, is often closed at evening by despair.”
—Ralph Waldo Emerson (1803–1882)
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