What is outside the circle of a resistance type Peter Hagar Smith chart?
Electricity and Magnetism
Level
3
What is outside the circle of a resistance type Peter Hagar Smith chart?
To be specific: the solid blue circle just inside the annotated red circle.
Nothing can be outside the circle.
Negative reactance
Negative resistance
Vacuum
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1 solution
As Dr. Smith pointed out from the audience at a presentation at a conference, when the presenter said that there was no meaning or usefulness to the region outside of the unit circle that forms the reactance axis at the zero resistance point, that that region was the negative resistance region and that there were devices that exhibit negative resistance over at least part of their operating region.
Negative reactance is capacitive.
Vacuum was thrown in as a distractor and as another way of saying nothing .
Some devices that exhibit negative resistance over at least part of their operating regions are Gunn diodes, tunnel diodes, fluorescent lighting tubes neon indicator lamps (e. g., NE-2 and NE-51).
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