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Derived the expression for voltage 
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#1
Mar306, 02:18 AM

P: 12

The current in a 15 millihenry inductor is known to be:
i = 4 amperes, for t < 0 and i = A1 * e 2000*t + A2 * e 8000*t amperes, for t > 0 The voltage across the inductor (assuming the passive sign convention) is 58 volts at t = 0(+) seconds. I need to find the constants a1 and a2. I have already derived the expression for voltage @ t=0: 58=30(a1+4*a2). Unfortunately, I am now lost. I cannot figure out an equation with 2 unknowns. Any help would be greatly appreciated. I don't believe the fact that i = 4 amperes, for t < 0 is significant for this part of the problem. 


#2
Mar306, 02:50 AM

P: 12

never mind, I was overthinking the problem.



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