Alternating Current

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1. A 150-W light bulb is operating on a 120-V rms ac line. What is the rms current in the bulb?
2.50 A
1.67 A
1.50 A
1.25 A
0.883 A

2. What is the inductive reactance of a 200-mH inductor attached to a 120-V rms 60.0-Hz source?
12.0 ohms
75.4 ohms
1,880 ohms
940 ohms
24.0 ohms

3. An RLC series circuit has a 400-ohm resistance, a 2.5-mH inductor, and a capacitor. If the circuit is in resonance at 30 kHz and is attached to a 20-mV rms power supply, what is the rms voltage across the inductor?
20 mV
24 mV
16 mV
48 mV
0

4. An RLC series circuit has a 200-ohm resistance, a 3.0-mH inductor, and a 100-microF capacitor. At resonance, what is the inductive reactance?
210 ohms
5.5 ohms
11 ohms
25 ohms
30 ohms

5. A 2.2-kilo-ohm resistor and a 2.0-micro-F capacitor are in series in an ac circuit. The rms voltages across each are equal. What is the frequency?
230 Hz
115 Hz
72 Hz
36 Hz
Not enough information.

6. A series RLC circuit has a capacitive reactance of 16 ohm and an inductive reactance of 4 ohm at 30 Hz. What frequency would result in resonance for this circuit?
120 Hz
60 Hz
15 Hz
7.5 Hz
Resonance is not possible in this case.

7. In a series LRC circuit the rms voltage across the resistor is 80 V, across the capacitor is 120 V, and across the inductor is 60 V. What is the rms voltage applied to this circuit?
60 V
80 V
100 V
120 V
140 V

8. A series RLC circuit has a resistance of 500 ohms, and inductance of 20.0 mH, and a capacitance of 2.00 microF. The power source provides a voltage of v = (170 sin(377t))V. What is the peak current in this circuit?
92.4 mA
101 mA
121 mA
170 mA
240 mA