Q:- What is Hysterisis?
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Hysteresis is the dependence of the state of a system on its history. For example, a magnetmay have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past. Plots of a single component of the moment often form a loop or hysteresis curve, where there are different values of one variable depending on the direction of change of another variable. This history dependence is the basis of memory in a hard disk drive and the remanence that retains a record of the Earth's magnetic field magnitude in the past.
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If you pay close attention to your AC unit (set, say, to 78 degrees), you may notice that it turns on when the temperature rises to 79 degrees and off when the temperature falls to 77 degrees. This behavior is called hysteresis, and AC units are designed this way deliberately. If the unit cycled precisely at 78 degrees in both directions, it would switch on and off much more frequently and wear out more quickly. Hysteresis causes the temperature at which the unit switches to depend on the direction the temperature is moving.
Technically, a physical system has hysteresis when its output depends on both present and past inputs. In the case of the AC unit, the behavior at the set point (78 degrees in our example) depends on recent temperature history: if the temperature is rising through 78 degrees, the system will be off until the temperature reaches 79 degrees; but if the temperature is falling through 78 degrees, the system will be on until the temperature reaches 77 degrees. The direction of temperature change matters, and knowing what that direction is requires knowledge not only of the present temperature but of temperatures in the recent past as well.
HOPE IT HELPS!!!!!!!!
If you pay close attention to your AC unit (set, say, to 78 degrees), you may notice that it turns on when the temperature rises to 79 degrees and off when the temperature falls to 77 degrees. This behavior is called hysteresis, and AC units are designed this way deliberately. If the unit cycled precisely at 78 degrees in both directions, it would switch on and off much more frequently and wear out more quickly. Hysteresis causes the temperature at which the unit switches to depend on the direction the temperature is moving.
Technically, a physical system has hysteresis when its output depends on both present and past inputs. In the case of the AC unit, the behavior at the set point (78 degrees in our example) depends on recent temperature history: if the temperature is rising through 78 degrees, the system will be off until the temperature reaches 79 degrees; but if the temperature is falling through 78 degrees, the system will be on until the temperature reaches 77 degrees. The direction of temperature change matters, and knowing what that direction is requires knowledge not only of the present temperature but of temperatures in the recent past as well.
HOPE IT HELPS!!!!!!!!
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