So in England we have the ground prong so our cables are all the same, however I know in the states and other places they don’t, so how come no damage is caused if the positive and negative are the wrong way around?
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It’s AC. What positive and negative? Frankly, I dislike the idea of polarized plugs for general use. It breeds a flawed expectation in electrical engineers that they know which is live and which is neutral because they have it marked so on a schematic. No, you don’t know, because schematic is not the real world, and of course, some doofus will mix things up. It’s better to begin from the assumption that you have no idea which is which. In a device, it’s generally not necessary to make the distinction.
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