Figure P8.48 100 Ω 20 Ω 12 2 t = 0 300 V 2 mH 5 µF

75 V R1 82 k Ohm 1 uF 22 Ohm When the switch is closed the Triac is triggered. If the trigger voltage of the Diac is 32 V and the Triac has a trigger voltage of 1 V, what is, in the ideal approximation, the current that flows through the gate of the Triac at the precise instant of its triggering? Justify your answer by drawing the circuit diagram at that instant.

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The switches in the circuit shown below have been open (left switch) and closed (right switch) for a longtime. At time equal to zero this switches change as indicated in figure. a) Find the numerical expressionsfor iL(t) and vo(t) for t ≥ 0. b) Find the numerical values of vL(0+) and vo(0+).