Question
Asked Feb 25, 2020
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'7 For t> 0, determine for what value of t i = 2.5 A
in the circuit of Figure P5.77 if the circuit is in steady
state at t = 0-.
2Ω
ww
40 V
:20
3Ω
ww
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'7 For t> 0, determine for what value of t i = 2.5 A in the circuit of Figure P5.77 if the circuit is in steady state at t = 0-. 2Ω ww 40 V :20 3Ω ww

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Expert Answer

Step 1

At the steady-state, the inductors act as the short circuit and the circuit becomes completely resistive as shown in the figure given below.

Electrical Engineering homework question answer, step 1, image 1

Step 2

The current drawn for the source is given by,

Electrical Engineering homework question answer, step 2, image 1

The current drawn from the source.

Electrical Engineering homework question answer, step 2, image 2

Step 3

The current I shown in the figure is given by,

Electrical Engineering homework question answer, step 3, image 1

When the position of the switch is changed, take the Laplace transform of the circuit.

Keep in mind that after closing the switch the inductor will behave like the voltage source so mention the current source in the Laplace domain.

Electrical Engineering homework question answer, step 3, image 2

...

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