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<p>suppose the line is terminated with a <a href="page.php?w=impedance_matching">matched</a> resistor (so that all of the pulse energy is delivered to the resistor and none is reflected back). By <a href="page.php?w=Ohm%27s_law">Ohm's law</a>, the power delivered to the resistor at time  is equal to , so the total energy is found by integrating  with respect to time over the duration of the pulse. To find the value of the energy spectral density  at frequency , one could insert between the transmission line and the resistor a <a href="page.php?w=bandpass_filter">bandpass filter</a></p><p>
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