When a bulb lights up on passing current, the change of energy is:
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A light bulb is a very fine wire made of tungsten, sealed in an inert gas atmosphere. When a current is flowing through the wire, electrical energy is converted to heat, which makes the wire extremely hot -- almost 1000oF! Objects this hot give off visible light, and there is your light bulb.
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A light bulb is a very fine wire made of tungsten, sealed in an inert gas atmosphere. When a current is flowing through the wire, electrical energy is converted to heat, which makes the wire extremely hot -- almost 1000oF! Objects this hot give off visible light, and there is your light bulb.
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