In high voltage dc, electrons come from negative terminal and deposits in the positive terminal. If you touch only positive terminal, then does it suck electrons from your body?
And I understand that neutral wires are grounded at the transformer. So how can a connection between me and the ground shock me?
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Others have answered your question more directly, but I think it is important to understand:
By definition, voltage just means 2 locations have a difference in electrical charge. We ground things to all be on the same level. If something has no ground, or a bad ground, it can become elevated. An elevated electrical device might still have 12V DC between it’s terminals, but you are at a different voltage that might be higher or lower than the negative terminal.
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