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<p>used to generate <a href="page.php?w=electricity">electricity</a> may have 30-40% efficiency.</p>

<p><big> Efficiency of devices at point of maximum power transfer </big></p>
<p>As a result of the <a href="page.php?w=maximum_power_theorem">maximum power theorem</a>, devices transfer maximum power to a load when running at 50% electrical efficiency. This occurs when the load resistance (of the device in question) is equal to the internal <a href="page.php?w=Th%C3%A9venin%27s_theorem">Thevenin equivalent</a> resistance of the power source.  This is valid</p><p>
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