Consider the circuit shown in Figure P 8.3-24a and corresponding plot of the inductor

Chapter 8, Problem P8.3-24

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QUESTION:

Consider the circuit shown in Figure P 8.3-24a and corresponding plot of the inductor current shown in Figure P 8.3-24b. Determine the values of L, \(R_1\), and \(R_2\).

Hint: Use the plot to determine values of D, E, F, and a such that the inductor current can be represented as

\(i(t)=\left\{\begin{array}{l} D \text { for } t \leq 0 \\ E+F e^{-a t} \text { for } t \geq 0 \end{array}\right.\)

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QUESTION:

Consider the circuit shown in Figure P 8.3-24a and corresponding plot of the inductor current shown in Figure P 8.3-24b. Determine the values of L, \(R_1\), and \(R_2\).

Hint: Use the plot to determine values of D, E, F, and a such that the inductor current can be represented as

\(i(t)=\left\{\begin{array}{l} D \text { for } t \leq 0 \\ E+F e^{-a t} \text { for } t \geq 0 \end{array}\right.\)

ANSWER:

Step 1 of 8

The given circuit is a first order circuit with one inductor.

The output can be expressed as:

      =                ,    

               ,                                      (1)

 

We can rewrite this equation to get the following:

=                                ,        

            ,                             (2)

If we compare these two equations we can see that:

                                                            (3)

We can read the values of , and  from the graph.

For  we can see that the value of current equals ,meaning:

Current of the inductor cannot change instantly:

                                                (4)

For  we can read that the  equals ,meaning:

                                                                      (5)

From equation 3 we can find the value of :

     =

The output of the circuit, knowing these values, equals:

                                                 (6)

 

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