![]() ![]() Also, we would have to measure the amount of sunlight coming through the windows. If windows in the house can be opened, we would have to measure whether the windows are open, and the rate of air flow (wind speed and direction). So we would have to measure also the temperature of the furnace. How well the furnace is working depends on the temperature of the furnace flame. Why? Well, we might realize that the temperature is also controlled by how well the furnace is working. Experience shows that this is not effective. Such a controller would have no feedback, because what would be measured would not be affected by the controller itself. We might think about designing a system that would measure the temperature outside the house, rather than inside the house, and use this to calculate what fraction of time the furnace should be running. The goal, in this case, is a reasonably uniform temperature which is specified by the position of the temperature dial. The control of the furnace changes the temperature in the room, which is measured by the thermostat which controls the temperature. ![]() The thermostat also measures the temperature in the room to determine when to turn the furnace on and off. It contains a controller that turns the furnace on and off which heats the room. Feedback is a circular process of influence where action has effect on the actor.įor example, a thermostat that controls the temperature in a house uses feedback. ![]()
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