Why does an electric bulb become dim when an electric heater in parallel circuit is switched on? Why does
dimness decrease after sometime?
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The resistance of a heater coil is less than that of electric bulb filament. When heater is switched on in parallel, more current start flowing through the heater coil and current through the bulb filament decreases making it dim. After some time, when heater coil becomes hot its resistance increases.
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Answer:
The resistance of a heater coil is less than that of electric bulb filament. When heater is switched on in parallel, more current start flowing through the heater coil and current through the bulb filament decreases making it dim. After some time, when heater coil becomes hot its resistance increases.
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