how do multi outlet plugs work?

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I believe that electrical devices need a certain voltage and current. So why aren’t multi outlet plug screwing thing up? And is it a good idea to put a multi outlet plug into another multi outlet plug? I’m guessing it’s not, but I want to know why

In: 1

The sockets are wired in parallel, not series. As such, unneeded sockets can be left empty without interrupting other sockets.

Electrical devices only need a certain voltage. They regulate the current themselves. Fuses are safety systems and not current regulators. When you connect wires in parallel like when you have multiple outlets the voltage stay the same but the current is added together. So each device gets the same voltage and is then regulating the amount of current they need themselves. The outlet will then let the current to both devices go through the same plug loading the circuit with the combined current.