Does it conduct at certain voltage (short). YesDoes it conduct at certain voltage (short). Why do some have resistors (To limit current?)?
I have recently experimented with one and applied 120VAC only to one side without completing the "loop"; The bulb was "dim".A neon bulb does not conduct at all, up to a certain voltage. Then the gas in the tube ionizes and it starts conducting. At that point, it pretty much looks like a short circuit, so the current must be limited by a resistor or it will blow up. Once the gas is ionized, it will conduct at a lower voltage than was initially needed. This is called negative resistance, since an increase in current was accompanied by a decrease in voltage across the bulb.
Basically the way that Neon AC power detection screwdrivers work.One year people in one of my electronics labs entertained themselves by holding a neon bulb and inserting the other lead in a wall socket and watching them glow.
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