How to tell which wire is positive and which one is negative on a light bulb - Quora

Answer (1 of 2): If you are seeing an illuminated incandescent bulb, you cannot tell just by looking at it. If you are seeing a 60 watt or higher incandescent bulb, you can make a reasonable guess that you are noticing an AC effect and both polarities are at work by turns on each wire.. if you ar

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