Question

light from bathroom bulb gets dimmerfor a moment when geyser is switched on why

Answer 1

in most cases Light from bathroom bulb gets dimmerfor a moment when geyser is switched on because load of electicity suddenly increases.
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Answer 2

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 the heavy appliance(geyser) connected with it. So, bulb gets slight dimmer for a moment.