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9. A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 ∠0° mA. The source voltage, expressed in polar form, is ________.
(a) 3.84 ∠20.6° V
(b) 12.8 ∠20.6° V
(c) 0.3 ∠20.6° V
(d) 13.84 ∠69.4° V
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5555555555 10. A 12 kΩ resistor is in series with a 0.02 μF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3 ∠0° mA, what is the source voltage expressed in polar form? (a) 45.6 V (b) 411.3 V (c) 0.411 V (d) 4.11 V- 5555555555 21. A 12 kΩ resistor, a 15 kΩ resistor, and a 22 kΩ resistor are in series with two 10 kΩ resistors that are in parallel. The source voltage is 75 V. Current through the 15 kΩ resistor is approximately ________. (a) 14 mA (b) 1.4 mA (c) 5 mA (d) 50 mA
- 5555555555 11. A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is ________. (a) 564 (b) 0.564 (c) 6.76 (d) 55.7
- 5555555555 11. A capacitor with 150 Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is ________. (a) Z = 150 (b) Z = 150 ∠90° Ω (c) Z = 150 ∠–90° Ω (d) Z = 150 ∠180° Ω
- 5555555555 18. A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 kΩ. Current flow in the circuit is ________. (a) 9.2 mA (b) 92 mA (c) 4.6 mA (d) 460 mA