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<a accesskey="3" href="page.php?w=characteristic_impedance&amp;p=2">3.Next</a>
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<p>The <b>characteristic impedance</b> or <b>surge impedance</b> (usually written ) of a uniform <a href="page.php?w=transmission_line">transmission line</a> is the ratio of the amplitudes of <a href="page.php?w=voltage">voltage</a> and <a href="page.php?w=Electric_current">current</a> of a wave travelling in one direction along the line in the absence of <a href="page.php?w=Reflections_of_signals_on_conducting_lines">reflections</a> in the other direction.  Equivalently, it can be defined as the <a href="page.php?w=input_impedance">input impedance</a></p><p>
<a accesskey="3" href="page.php?w=characteristic_impedance&amp;p=2">3.Next</a>
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