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: If two '''potentials''' are the same, then no [[Work Done|work]] is done on the [[Electrical Charge|charge]].
: If two '''potentials''' are different this is called a [[Potential Difference|potential difference]] and [[Work Done|work]] is done on an [[Electrical Charge|electrical charge]].
: Without a [[Potential Difference|'''potential''' difference]] [[Electrical Current|current]] will not pass through an [[object]]. This is why birds can stand on high '''voltage''' [[Transmission Line|power lines]]. The '''potential''' at each of their feet is identical, so no [[Electrical Current|current]] will pass through their body.