When using extensions cords I find that I feel like there is similar amount of electricity going through it as just plugging a cable into the wall without using an extension cable. When I charge my phone I get similar speeds using either, but surely an extension cord spilts the voltage?
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No, it doesn’t split the voltage. It really is just what the name says, an extension. It’s the same as if your phone charger prongs were 10 feet long, but flexible.
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