CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Lightning conductor on the outside of a tall tower. The conductor (green) protects the building from lightning strikes by providing a path of least resistance for the current to flow to earth. It consists of a metal rod at the top of the tower and a strip of metal running to down the side of the building to a plate buried in the ground (not seen). The conductor is made from a metal with a very low resistance, usually copper.
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