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18. A 120-V rms voltage at 1000 Hz is applied to a resistor and an inductor in series. If the impedance of this circuit is 110 ohms, what is the maximum value of the current?

19. A 200-ohm resistor, a 40.0-mH inductor and a 2.00-uF capacitor are connected in series with a 120-V rms source at 1000 Hz. What is the impedance of this circuit?

20. A series RLC circuit has a 100-ohm resistor, a 4.00-mH inductor and a 0.100-uF capacitor connected across a 120-V rms ac source at the resonant frequency. What is the power dissipated by the circuit?

21. A series RLC circuit has a 100-ohm resistor, a 2.00-mH inductor and a 0.100-uF capacitor connected across a 120-V rms ac source operating at 1000/pi Hz. What is the resonant frequency of this circuit?

22. A series RLC circuit has a 100-ohm resistor, a 2.00-mH inductor and a 0.100-uF capacitor connected across a 120-V rms ac source operating at 1000/pi Hz. What is the rms voltage across the inductor?