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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Your title is not really accurate.
When YOUR body complete a with a potential (voltage )source circuit you have current flowing through you.
The hazardous voltages are typically above 50v – and most work related electrical regulations start there.
So if you are standing in or otherwise touching ground, and you touch a neutral in an AC system… which should be grounded – normally you should not be “shocked”. If there are problems in the system ( improper grounding, miswiring, electrical faults ) then the neutral conductor (wire) MAY have potential to ground and therefore it presents a hazard. So you are required to treat it as an energized conductor.
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