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the metal wire in an incandescent lightbulb glows when the light is switched on and stops glowing when it is switched off. the simple process in which kind of a change

User Rphv
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When the metal wire in an incandescent lightbulb glows when the light is switched on and stops glowing when it is switched off, this is an example of resistance, which provides light and heat. 
User Swimburger
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