1. A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is
2. The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency
3. In the complex plane, the number 4 + j3 is located in the
4. When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
5. A 47 resistor and a capacitor with a capacitive reactance of 120 are in series across an ac source. What is the circuit impedance, Z?
6. What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?
7. The complex number 6 + j6 is equivalent to
8. In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is
9. An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
10. What is the angular difference between +j4 and –j4?
11. A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k. Current flow in the circuit is
12. For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is
13. When the frequency of the voltage applied to a series RC circuit is increased, the phase angle
14. In a series RC circuit, when the frequency and the resistance are halved, the impedance
15. A 2 k resistor is in series with a 0.015 F capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?
16. A 12 k resistor is in series with a 0.02 F capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.30° mA, what is the source voltage expressed in polar form?
17. The complex number 40 55° is equivalent to
18. A 120 resistor is in parallel with a capacitor with a capacitive reactance of 40 . Both components are across a 12 V ac source. What is the magnitude of the total impedance?
19. A 47 resistor and a capacitor with 150 of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is
20. A 2 k resistor and a 0.002 F capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is
21. A capacitor with 150 of capacitive reactance is across an ac source. The impedance, expressed in polar form, is
22. When the frequency of the voltage applied to a series RC circuit is decreased, the impedance
23. A complex number represents a phasor quantity.
24. Complex numbers can be added and subtracted but not multiplied or divided.
25. The power factor (PF) indicates how much of the apparent power is true power.