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Homework Help: RL circuit - charging ?

  1. May 25, 2014 #1

    What happens when the switch closes? Does the inductor continue to charge? If yes, how can this be so when the inductor is already fully charged (the question says the switch was open for a long time, so I assumed it has been fully charged)?
  2. jcsd
  3. May 25, 2014 #2

    rude man

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    Gold Member

    First, an inductor does not 'charge'. It sustains a current.

    Before the switch closes the inductor sustains a certain constant current. When the switch closes the inductor current will start to sustain a larger current. Eventually it will sustain 4 times as much current as before the switch was closed.
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