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How come birds on electric wires don't get electrocuted?

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In order for electricity to flow through a conductor, the voltage at one point on the conductor must be made different from the voltage at another point.

For example one end of a wire (which is a conductor) can touch one terminal of a battery, but there's no current in the wire until its other end touches the other battery terminal.

The bird's body could also be a conductor, but both feet are at the same voltage, since both are touching the same wire.

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