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Message: <blockquote data-quote="imhotep" data-source="post: 28487169" data-attributes="member: 562115">Passive lightning rods work on the principle of induction.  A thunder cloud usually has the underside negatively charged & the cloud top thus has a positive charge.  When a cloud passes by the building, the conductor gets charged oppositely through induction and this acquired charge moves to the earth through the earthing system. The Earth acts as a massive charge reservoir.The air becomes a conductor in the presence of a large electric field, and this electric field is strong around sharp objects and that's why there are prongs in the arrester. Also the ionization of air around a lightning conductor rod then allows the lightning to strike more randomly.[ATTACH=full]193935[/ATTACH][ATTACH=full]193936[/ATTACH]PS: Who says there's no current through the copper strip. The copper allows a low resistance path to the charges. When there's a flow of charge, don't forget thati = dq/dt.</blockquote>

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