The valve on the cooler compare with the switch in an electric circuit such that opening the valve allows water to flow, just like opening a switch allows charges to flow.
What is Valve?
This refers to a substance which regulates the flow of a liquid by opening or closing it and is commonly used in pipes and other types of fittings. It also has some similarities in functions with that of a switch which is used in an electric circuit.
Opening the valve allows water to flow which is the same as how opening a switch allows charges to flow and vice versa which is the most appropriate comparison between the two substances.
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