if electrical extension cords are meant to be used to connect to an outlet farther away then why is it still bad to plug certain things into them Ex: electric heaters, A/C units and so on?
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This is mainly a US thing, because having 110V means losses to resistace are higher, hence cables getting warmer. The cable inside the wall is solid copper, to handle the current, but the extension cord isn’t. Meaning that many extension cords aren’t rated for the max current an outlet can give.
In Europe and much of the rest of the world, we have 220V, which makes it easy to make all our extension cords rated to 16 A, the maximum a wall outlet can give. This is plenty of power (3,5 kW), and the fuse/breaker will trip before the cable overheats.
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