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The glass envelope of a light bulb (which is called an incandescent lamp) is an insulator, and it won't conduct electricity except under the most extreme conditions. Connecting wires to the glass envelope won't complete an electrical circuit.

That glass envelope is used to seal the inside of the lamp from outside air, which, if allowed in, would allow the filament to burn up in a second or two. In that light, the glass envelope both electrically insulates the lamp, and also isolates the filament from air (or the oxygen in it) to keep it from burning up.

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15y ago

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