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when a current pass through a conductor it will heat it and raise its temperature, electrons will starts vibrating the conductor's atoms. Bound electrons in the vibrating atoms may be boosted temporarily to a higher energy level. When they fall back to their normal levels, the electrons release the extra energy in the form of photons. when a conductor is overheated it will melt down, tungsten is used in light bulbs since its meltdown temperature is very elevated. more than 90% of the released energy falls in the infrared range which is invisible to human eyes and only 10% of the emitted radiation is visible.

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