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<p>conditions. The rated output impedance is the impedance into which the amplifier can deliver its maximum amount of power without failing.</p>

<p><big> Batteries </big></p>
<p><a href="page.php?w=Internal_resistance">Internal resistance</a> is a concept that helps model the electrical consequences of the complex chemical reactions inside a <a href="page.php?w=Battery_%28electricity%29">battery</a>.  It is impossible to directly measure the internal resistance of a battery, but it can be calculated from current and voltage data measured from a circuit.</p><p>
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