t = 0 30 120 V $30 N 38 mH §20 7.1-4 Full Alternative Text

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
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ISBN:9781337399128
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Chapter2: Basic Electricity
Section: Chapter Questions
Problem 25RQ: Which of the following is the best insulator? a. wood b. thermoplastic c. copper d. cast iron
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1. 7.1 The switch in the circuit shown has been closed for a long time and
is opened at t=0.
1. a) Calculate the initial value of i.

t = 0
30
120 V
$30 N
38 mH §20
7.1-4 Full Alternative Text
Transcribed Image Text:t = 0 30 120 V $30 N 38 mH §20 7.1-4 Full Alternative Text
Expert Solution
Step 1

a)

The circuit diagram for t<0 is given as,

Electrical Engineering homework question answer, step 1, image 1

Calculating the equivalent resistance,

Req=130+16=5 Ω 

The expression for the voltage division rule is given as,

v=vs×55+3=120×55+3=75 A

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