Current in an RL Circuit
(a) An RL circuit with a switch to turn current on and off. When in position 1, the battery, resistor, and inductor are in series and a current is established. In position 2, the battery is removed and the current eventually stops because of energy loss in the resistor. (b) A graph of current growth versus time when the switch is moved to position 1. (c) A graph of current decay when the switch is moved to position 2.
Source
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"OpenStax College, College Physics. January 25, 2013."
http://cnx.org/content/m42425/latest/?collection=col11406/1.7
OpenStax CNX
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