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 wants to go to ground. This means literally the ground if the earth.
In this poster someone is peeing on a suspended power line.
Urine has less resistance than air so the easiest way to electric to flow would be up the urine stream. Then into your body and out one of your legs to the ground.
This is because the body is mostly water.
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