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Series RLC Network An example on how to solve for A 1 and A 2

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Series RLC Circuit Note that these two circuits are the same. A single pole/double throw switch (a switch that is composed of one wire that is moving between two points in the circuit) in the upper circuit causes the 5 V supply to be removed from the circuit at t = 0 s. The step function in the lower circuit causes the output of the voltage supply to change from 5 V to 0 V at t = 0 s.

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Step Function The unit step function, u(t), in this circuit has the following definition:

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Determining the type of solution Note that this calculation can be done before we have even identified which voltage or current will be should be used when writing the solution to the 2 nd order equation.

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Boundary Conditions In d.c. steady state, the capacitor will act like an open circuit (∞ )and the inductor will act as a short circuit (0 ). The initial and final conditions for the voltages and currents are:

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You find that that A 1 = 5 V (3 sig. figs.) and A 2 = -7.97 x 10 -6 V = -7.97 V

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