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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If it is correctly rated and fully unwound, there isn’t a problem, unfortunately people don’t understand those requirements and get it wrong which causes issues. Two similar looking cables may have very different thickness of copper inside so can’t carry the same current and wire wrapped around a drum can’t radiate any heat so it just builds up temperature. There is also an electrical phenomenon called induction which is intensified by wrapping the wire on a drum and can make the voltage increase to beyond what the cable can cope with.
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