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<p>laws of thermodynamics. These <a href="page.php?w=laws_of_thermodynamics">laws of thermodynamics</a> apply regardless of the size of the system. Thus, machines that extract energy from finite sources cannot operate indefinitely because they are driven by the energy stored in the source, which will eventually be exhausted. A common example is devices powered by ocean currents, whose energy is ultimately derived from the Sun, which itself will eventually <a href="page.php?w=End_of_the_Sun">burn out</a>.</p>

<p><big>History</big></p>
<p>The history of perpetual</p><p>
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