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I want to know what is the smallest device that can work on a few milli amps? I know a NE-2 neon bulb works on less than 10 mAmp but on 90 volts at least.

I need to find a small device that: 1- Consumes electricity 2- works independently (just by hooking it to a battery) 3- Operates on a few volts 4- Operates on very few amps 5- Preferably a device that works by ionizing air (like a neon bulb), not a direct resistance.

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closed as off topic by Qmechanic Apr 16 '13 at 15:42

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A galvanometer has every property (except the ionizing thing) that you ask..! ;-) – Waffle's Crazy Peanut Apr 16 '13 at 15:34
Is this question (v1) too localized? Would be a better home for this question? – Qmechanic Apr 16 '13 at 15:36
I see. But a galvanometer does not work on the small voltage/amperage by itself. It works through its battery, so it actually consumes more electricity that it measures. :) – Moha Apr 16 '13 at 15:37
@Qmechanic correct. Sorry for that. Can I move it there? – Moha Apr 16 '13 at 15:40