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| 7.2 The Source-Free |
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| RL Circuit (4) |
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| The key to working with a
source-free RL |
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| circuit is finding: |
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| where |
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| 1. | The
initial voltage i(0) = I0 through the |
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| inductor. |
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| 2. | The time
constant = L/R. |
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