feedback+examples

ANOTHER WAY OF DESCRIBING THE LOOPS

A **feedback loop** occurs when the output of a system serves as input to that same system, creating a circular process.

A **positive feedback loop** uses the output from a process to augment (increase) that process. **An example of a positive feedback loop is when a microphone** **picks up sound from a speaker and amplifies it in a cycle that** **gets louder and louder.**

A **negative feedback loop** reverses the direction in which a system is moving. **A thermostat for example regulates room temperature via a pair of** **negative feedback loops with a furnace. When the room becomes** **too hot, the thermostat turns the furnace off and when it** **becomes too cold, the thermostat turns the furnace on.** @http://dtc.pima.edu/blc/105/502/502answers.html