110V is considered safer if you get shocked by it, due to the fact that your body has a greater chance of resisting the shock at this voltage. It’s true that all things being equal amps are more dangerous than volts as far as killing you goes, but 220V has a greater chance of pushing those amps into your body than 110V does. On the other hand 220V is less wasteful. DC power conversion requires less heat at this voltage because there are fewer amps to do the same work.
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