A Bulb In An Electrical Circuit Refuses to Glow

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Description
While explaining conductivity an experiment is performed to show how the conductivity of pure water changes when some salt is added to it. This explains the behaviour of the bulb. Drift velocity, Ohm's law,resistivity are other topics discussed. This is a Youtube.com video.

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Kajal Sengupta
Physics teacher of 9th to 12 th grade,A, AS level
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