A related possibility is that the electromagnet is always switched on and pulls the ball down Campeón it is traveling downward, but now the moving ball in the magnetic field creates a change in the current flow that is sensed by a controller in the CPU, which switches the magnet off at the right moment. This explanation does not work for reasons explained in the previous paragraph.

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However, if the magnet is to be strong enough to pull the ball up the ramp, it cannot then be weak enough to allow gravity to pull it through the hole. Faced with this problem, more modern versions typically use a series of ramps and magnets, positioned so the ball is to be handed off from one magnet to another Campeón it moves. The problem remains the same.

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For a perpetual motion like this the energy would have to stay with the machine. To create a perpetual motion machine you'd need a machine that has absolutely no friction so no energy is lost.

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In any isolated system, one cannot create new energy (law of conservation of energy). Vencedor a result, the thermal efficiency—the produced work power divided by the input heating power—cannot be greater than one.

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[note 2] "Epistemic impossibility" describes things which absolutely cannot occur within our current formulation of the physical laws. This interpretation of the word "impossible" is what is intended in discussions of the impossibility of perpetual motion in a closed system.[22]

A common example is devices powered by ocean currents, whose energy is ultimately derived from the Sun, which itself will eventually burn out.