closed as unclear what you're asking by The Photon, M. Enns, Jon Custer, ZeroTheHero, Emilio Pisanty Jan 16 at 18:02
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No, it does not oppose the law of the conservation of energy. In circuits the conservation of energy is more properly represented as conservation of power. Power in a circuit is given by $P=IV$. Voltage by itself is not conserved, so a change in voltage does not indicate a failure of the conservation of energy.