They are referring to voltage drop. Voltage is electrical pressure pushing current (amps) through a wire. Think of it like a water hose. Pressure pushes water through a hose. The walls of the hose resist the flow of water. As long as the hose isn’t too long, your pressure at the end is usable, but if the hose is too long, the pressure drops off along the way due to the resistance of the wall. Same thing happens to voltage in a wire.
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