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i82muchpi
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Homework Statement
Determine the value of the current labeled i and the voltage labeled v at t=0+, t= 1.5 ms, and t = 3.0 ms.
Homework Equations
Ohm's law: v = i *r
Decay in source free RC Circuit v(t) = v@0 * e^(-t/RC)
The Attempt at a Solution
i(0-) = 0.1 A.
Therefore,
v across 200 ohm = 200* 0.1 = 20 V
Since no current flows through capacitor with constant dc current,
v across capacitor = 20 V @ t < 0
v across capacitor cannot change immediately as it would require infinite power so v across capacitor @ t = 0 = 20 V
Here's where the confusion is: Should I include the 200 ohm resistor in my RC circuit? Why or why not? Also, will my circuit be a source free RC circuit?
Also, what will be the current i through the 200 ohm resistor when t>0?
My last question is a theoretical one: Can a current through a resistor change immediately at one instant of time?
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