Mechanical Switches
As convenient as it is to be able to turn on electricity, think how bad it would be if you couldn't turn it off. An electric furnace that never shut down could turn a home into a toaster. An electric burner you couldn't turn off could be a real fire hazard. Switches that allow you to turn on and off lights or a toaster oven are called mechanical switches. They're called "mechanical" because they have moving parts.
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