Saw a 1930s poster warning about the dangers of electrocution and it had a red line (most probably the electricity) going from source to victim to ground. Why is that?
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Electricity flows in a loop. Normally that loop is between the two prongs in an outlet, or the two wires in a power line.
The ground can often complete that loop. Because power lines are so big and have such high voltage, they will accept the ground as one side of the loop.
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