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In this circuit, we have a switch that
controls the supply of current to an inductor.<span style="mso-spacerun:
yes"> </span>An inductor resists any changes in current.<span
style="mso-spacerun: yes"> </span>If you open the switch, the
inductor tries to maintain the same current; it does this by charging the
capacitance between the contacts of the switch.<span style="mso-spacerun:
yes"> </span>(Any two wires in close proximity have some parasitic
capacitance between them.)<span style="mso-spacerun: yes">
</span>There is a small capacitor (much larger than the actual value)
across the switch terminals to simulate this.<span style="mso-spacerun:
yes"> </span>When you open the switch, the voltage goes very high;
in real life, this would cause arcing.</span><b><o:p></o:p></b></li>
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