if you have an issue with something powered by electricity, why do you need to count till 5/10 when you unplug/turn off power before restarting it?
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Think of it like a bottle of poison. Poison is electricity. The bottle is full. You have to wait until the bottle is empty so you don’t poison yourself or the bottle that contain it.
Some old things like Cathode Ray Tube monitors has an extra storage area that needed to be emptied also before you could service them.
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