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19. Explain mechanism of glowing bulb? Or Give two examples of poor conductors ofelectricity |
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Answer» Electricity flows through a THIN tungsten wire in the light bulb called the filament. The filament used in a bulb has a property called "resistance." Resistance is the amount of friction that an object will put against electricity flowing through it. A filament has a LOT of resistance to electricity. Therefore as a result of this, the filament heats up and starts glowing, CONVERTING electrical energy to light energy. This is because of the Joule-effect, which MEANS that resistances heat up when electrical CURRENT runs through them |
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