βš–οΈ Principles (Negative Feedback)


Introduction

Β Negative Feedback


Β 

Negative and positive feedback loops are very straightforward. This is a simplified description of their actions:

Something happens –> feedback β€œNO” –> something stops happening

Something happens –> feedback β€œYES” –> something keeps happening

Β 

Negative Feedback

The operation of an oven is an easy example of negative feedback acting both ways, which is how it usually acts. That means that there are deviations in two opposing directions. If an oven is set at 220Β°C, both a decrease and an increase in temperature is a deviation. So if the temperature drops or rises, a sensor picks that up and commands the heater to turn on or off.

This is negative feedback because it returns the system to itsΒ original state.

Sometimes completely separate sensors control a rise or fall in temperature. This separation gives a high level control……