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One of the most common mechanical feedback systems is the thermostat at the center of the heating system found in most homes and buildings. Once a temperature has been set on the thermostat, the system will try to keep the temperature in the house as close to that level as possible. If the temperature drops below that level, the thermostat responds by turning the furnace on. The furnace produces heat, which warms the air back up. Eventually, the temperature rises above the desired level and the thermostat shuts the furnace off. Then, if it is colder outside than inside, the house will cool down again until the thermostat turns the furnace on, and the whole cycle is repeated. This action, which counteracts (or "negates") undesired changes in the system's environment, is sometimes called a "negative feedback" loop. |
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Last Modified: 07 November 1999 |
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