This circuit is Problem 5.23 from Rizzoni\'s text. Take V1 = 12 V, C = 0.5 mu F,

Question

This circuit is Problem 5.23 from Rizzoni's text. Take V1 = 12 V, C = 0.5 mu F, R1 = 680 Ohm, R2 = 1.8 kappa Ohm. The switch has been open a long time before t = 0 so the initial value of the capacitor voltage is zero. Draw the circuit and proceed. Kee pi ng in mind that the voltage across a capacitor can't change instantly, find the current through the capacitor just after the switch is closed. According to Rizzoni the answer is 17.65 mA. Find the value of the capacitor voltage long after the switch is closed, at t = infinity. Find the time constant of the circuit for t > 0.

Explanation / Answer

a. i = vi/r1 = 17.65 mA

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