A bulb gets dimmer for a moment when a gyeser connected across the same source is switched on. Why?
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This is because the geyser and the bulb from the same source are connected in series with each other. As the geyser is switched on ,the current remains same but the voltage gets slight low due to heavy appliance ( geyser ) connected with it.
so, bulb gets dimmer for a moment.
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The bulb gets dimmer for a second because the current directed
towards the bulb is suddenly shared for a split second . At the exact moment
the geyser was turned on the tungsten got cooled a little . so the bulb becomes dimmer
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