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<p>If the component is a <a href="page.php?w=resistor">resistor</a> with time-invariant <a href="page.php?w=voltage">voltage</a> to <a href="page.php?w=electric_current">current</a> ratio, then:</p>

<p>where</p>

<p>is the <a href="page.php?w=electrical_resistance">electrical resistance</a>, measured in <a href="page.php?w=ohm">ohm</a>s.</p>

<p><big>Peak power and duty cycle</big></p>
<p>In the case of a periodic signal  of period , like a train of identical pulses, the instantaneous power  is also a periodic function of period .  The peak power is simply</p><p>
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