1. The switch in the figure has been open for a long time. It is closed at t = 0
ID: 2040130 • Letter: 1
Question
1. The switch in the figure has been open for a long time. It is closed at t = 0 s.
a. What is the current through the 20? resistor immediately after the switch is closed?
Express your answer to two significant figures and include the appropriate units.
b. What is the current through the 20? resistor after the switch has been closed a long time?
Express your answer to two significant figures and include the appropriate units.
c. What is the current through the 20? resistor immediately after the switch is reopened?
Express your answer to two significant figures and include the appropriate units.
10? 20 ? 10 mHExplanation / Answer
a) Rtot = 10 + 20 = 30 ohms
I = V / Rtot = 30 / 30
= 1.0 A
b) current through the 20 ohm resistor after the switch has been closed a long time
= 0
c) I = V / Rtot = 30 / 10
= 3.00 A
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