They lessen the electric flow to the lightbulb. It breaks up the flow of electricity.
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A beam of light becoming dimmer is a physical change since it is reversible. Recharging its source will make the light beam bright again.
Switches are made of plastic or bakelite because they don't conduct electricity.
Do nothing. But in a parallel circuit, all the bulbs will get dimmer.
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Some of the sci.lab rules are Do not touch if not told to do so,Wait for instructions,Keep Quiet,Do not loiter on other's work.