In the circuit shown in Figure, R = 10 , R L = 30 , L =

In the circuit shown in Figure, R = 10 Ω, R_L = 30 Ω, L = 150 mH, and C = 8 μF; the frequency of the ac source is 10 Hz and its amplitude is 100 V.

(a) Using phasor diagrams, determine the impedance of the circuit when switch S is closed.

(b) Determine the impedance of the circuit when switch S is open.

(c) What are the voltages across the load resistor RL when switch S is closed and when it is open?

(d) Repeat parts (a), (b), and (c) with the frequency of the source changed to 1000 Hz.

(e) Which arrangement is a better low-pass filter, S open or S closed?

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