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An extra thermodynamic curiosity arises from the definition that memristors/memristive devices should energetically act like resistors. The instantaneous electrical power entering such a device is completely dissipated as Joule heat to the surrounding, viz. no extra energy remains in the system after it has been brought from one resistance state x i to another one x j . Thus, the internal energy of the memristor device in state x i , U(V, T, x i ), would be the same as in state x j , U(V, T, x j ), even though these different states would give rise to different device’s resistances which itself must be caused by physical alterations of the device's material.