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SHM22    Moving-coil meters

    Critical damping is an important feature of moving-coil meters which are used to measure current and voltage. When the reading changes, it is of little use if the pointer oscillates for a while or takes too long to settle down to the new reading. The new reading must be taken quickly in case it changes again.

again the model can be used to understand the effects of increasing levels of damping. No Damping

the picture shows no damping case b = 0 Light Damping

the picture shows light damping case b = 0.1 Critical Damping

the picture shows critically damping case b = 2.0
Thus, a pointer is critically damped to allow it to move to the correct position immediately whenever a current flows through it or a voltage is applied across it. Heavy Damping

the picture shows heavy damping case b = 5.0 Model:

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Software Requirements


Android iOS Windows MacOS
with best with Chrome Chrome Chrome Chrome
support full-screen? Yes. Chrome/Opera No. Firefox/ Samsung Internet Not yet Yes Yes
cannot work on some mobile browser that don't understand JavaScript such as.....
cannot work on Internet Explorer 9 and below



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  • Oscillations
  • Junior College
  • Sciences
  • Computer Education
  • EasyJavaScriptSimulation
  • Android/iOS including handphones/Tablets/iPads
  • Windows/MacOSX/Linux including Laptops/Desktops
  • ChromeBook Laptops
  • Science
  • Simulations