A strip outlet, also known as a power strip, extension lead, power board and by many other variations, is a strip of electrical sockets that attaches to the end of a flexible cable and allows multiple devices to be plugged in.
An extension cord (and any length of conductor) has a resistance.
That resistance will reduce the voltage delivered and thus reduce the power delivered – its basic Ohm’s Law.
The practical effect of this is negligible under essentially all situations, but it is real none the less.
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