Which of the following is an example of negative feedback?

A signal that decreases the strength of the drive force needed to drive a device B.

A signal that increases the strength of the drive force needed to drive a device C. A signal that increases the strength of the drive force needed to drive a device

5) The positive feedback loop, which has a negative output, would be: a positive feedback loop where the input is the output B. A positive feedback loop where the output is the input C. A positive feedback loop where both the input and the output are the same

6) The term positive-feedback loop is most often used to describe an undesirable characteristic that occurs in: a device that is operating at its rated capacity B. A device that is being operated at its minimum level C. A device that is operating at its maximum level

7) According to the law of conservation of energy, energy is not transferred from a system to the environment. Energy can be lost to the environment but energy is not transferred from the system to the environment B. Energy can be lost to the environment but energy is transferred from the system to the environment C. Energy

8) Which of the following is the correct statement about feedback loops? Feedback loops cannot maintain a constant output because they allow for changes in the input B. Feedback loops can maintain a constant output by changing their gain C. Feedback loops are usually connected to one or more devices that

9) In a negative-feedback loop, the output signal is the input signal multiplied by some constant. This is called a negative-feedback loop because the output signal is the input signal multiplied by a constant B. This is called a positive-feedback loop because the output signal is the input signal multiplied by a

10) The term negative-feedback loop refers to the situation in which: a control device adjusts its own strength based on a signal from another control device B. A control device adjusts its own strength based on a signal from another control device C. A control device adjusts its own strength based

11) For a control system to operate with high performance, the feedback signal must be as accurate as possible. This statement describes a positive-feedback system B. This statement describes a negative-feedback system C.

What are positive and negative feedback in homeostasis?

1) Positive feedback is when an increase in A (input) causes a corresponding increase in B (output). For example, when a thermostat changes the temperature, it causes an increase in air flow which in turn causes a further increase in the temperature. The system has gone into positive feedback. As long as the temperature remains within limits, this will cause the air flow to remain at the set point, as long as thermostat remains at that set point, the temperature of the room will also stay within the limits and the air flow will not change.

2) Negative feedback occurs when the increase of A (input) causes a decrease in B (output), such as when a thermostat turns the heating or cooling off in an attempt to keep the room temperature down to an acceptable level. The thermostat causes the room temperature to fall, which in turn causes the room temperature to rise, so thermostat can keep the room temperature down to an acceptable level. The system goes into negative feedback, as long as the temperature remains within limits, the air flow will stay the same and the temperature will also remain within the limits.

If thermostat is not set, then there is no negative feedback, or if it is set too high, the thermostat will automatically change the temperature back to a set level. In negative feedback, the temperature could rise over the set point. If it is too low it will make the room colder than the set point.

Positive feedback is always useful, because it's usually the feedback that keeps things like a room at the right temperature, or a motor going, but negative feedback is necessary, because that negative feedback keeps the room at the right temperature, and the motor running. The difference between positive and negative feedback is important to understand: Think about how your room temperature is controlled. Usually, when you turn on thermostat, it will either turn the heat on or off. Now, you turn the temperature up until it reaches the temperature you want it to be. However, it's possible for thermostat to get into a state where it wants to turn the temperature down, and does so by reducing the amount of air being heated/cooled. This works great to lower the temperature of the room, until thermostat detects that the temperature is now above what it wants to be.