P 7.7-4 The circuit shown in Figure P 7.7-4 contains seven inductors, each having inductance of L.  The source voltage is given by

Find the current i(t) when L=4 H.

 

c07f126.eps

Figure P 7.7-4

Current is found from

We will assume i(0) = 0.  L needs to be total inductance so begin by recognizing two right most inductors are in series and therefore have an effective inductance of 2L.  This is now in parallel with the diagonal inductor, so that makes the effective inductance

 

 

Now we have the top inductor on the right in series with the effective inductance so

 

 

This is now in parallel with the middle inductor so

 

 

Finally this inductor is now in series with the remaining two inductors so

 

 

 

 

 

 

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This page last updated on April 13, 2019