What is hysteresis (simply)?

Question

I'm trying to understand what hysteresis is for my science GCSE. I've looked on websites on the internet, but I can't get my head around it. Can anyone explain it fairly simply?

Answer 1

the basic idea is :

1. you have a system (usually an object)

2. you apply a force on it, which will affect its properties (strength, magnetism, etc.) or its shape

3. then you apply a force opposite to the first applied force to try to recover the inital state of the system



the cycle 2. and 3. is refered to the hysteresis cycle



but the particularity is that after this cycle, the system doesn't get back exactly to its initial state

(this is due to imperfections in the system medium)

Answer 2

Hysteresis is a response of a particular system which depends on the history of the system's operation.



See

http://video.google.com/videoplay?docid=2266798550342930962#

and watch the video beginning at about 19 minutes on the duration. He will explain example 1.



Examples of systems which exhibit hysteresis:

1. Magnetic fields in an iron core of a solenoid as the iron magnetic domains saturate.



2. Schmitt Triggers, a configuration of the operational amplifier, designed to trigger at different input voltages based on their previous output.



3. Stress strain curves of loading and unloading of a material which deforms permanently due to yielding.



4. Pool boiling, the relation between heat flux and temperature difference when boiling a fluid in an initially stationary pool. When the critical heat flux is achieved, this relation demonstrates hysteresis.

Answer 3

What Is Hysteresis

Answer 4

Loss os energy