How come stage lights make a noise when they are turned off?

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How come stage lights make a noise when they are turned off?

In: Engineering
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You’re probably referring to the ‘clunk’ heard when large loads are turned on and off.

This comes from a contactor. Essentially a large relay that makes it safer for a human to turn the switch on and off, because the switch itself is carrying only a few milliamps where the contactor can carry hundreds of amps (hundreds of thousands of milliamps)