Delmars Unit 22 Resistive-Capacitive Parallel Circuits, AC - Unit 21, AC - Unit 22, Delmars Unit 21 Resistive-Capacitive Series Circuits, Delmars Unit 20 Capacitance in AC Circuits

Two capacitors, a 20 μF and a 30 μF, are connected in parallel to a 400 Hz source. What is the total capacitive reactance? 42.04 Ω 33.16 Ω 7.96 Ω 53.05 Ω

7.96 Ω

In a series RC circuit, ET = 240 V, R = 40 Ω, and XC = 30 Ω. What is ER? 144 V 157.14 V 202.86 V 192 V

192 V

A 1 μF capacitor has 2,652 Ω of reactance at 60 Hz. What is the reactance value at 400 Hz? 639.79 Ω 568.72 Ω 397.88 Ω 768.33 Ω

397.88 Ω

A series RC circuit has a resistance of 155 W and a capacitive reactance of 270 W. How many degrees is angle theta?

60.14°

In a series RC circuit, total impedance is a combination of resistances and _____ in a circuit.

reactances

In an RC parallel circuit, ET = 240 V, R = 500 Ω, and XC = 470 Ω. What is the reactive power? 215.2 VARs 83.94 VARs 59.38 VARs 122.55 VARs

122.55 VARs

A series RC circuit has two resistors and two capacitors. The resistors dissipate 9 W and 15 W. The capacitive powers are 18 VARs and 9 VARs. The applied voltage is 277 V. How much is circuit current?

130.4 mA

You connect a clamp-on ammeter and a voltmeter to a series RC circuit powered by a 60-Hz circuit. The voltage reads 240 V and the current is 0.715 A. The resistor is 150 Ω. What is the true power? 111.6 W 153.36 W 192 W 335.66 W

153.36 W

In a circuit containing a capacitor, the impressed voltage is _____ with the applied voltage. a. 270° out of phase b. 90° out of phase c. 180° out of phase d. in phase

180° out of phase

A series RC circuit contains two resistors and two capacitors. The resistors are 82 W and 47 W. The capacitors have capacitive reactances of 80 W and 50 W. The total impedance is _____.

183.14 W

In an RC parallel circuit, ET = 240 V, R = 30 Ω, and XC = 60 Ω. What is the phase angle (angle theta)? 90° 30° 26.57° 63.43°

26.57°

A series RC circuit contains two resistors and two capacitors. The resistors are 27 Ω and 56 Ω. The capacitors have capacitive reactances of 50 Ω and 40 Ω. What is angle theta? 72.68° 67.25° 52.75° 47.31°

47.31°

In an RC parallel circuit, ET = 120 V, R = 47 kΩ, and XC = 27 kΩ. What is IT? 4.62 mA 5.13 mA 7.55 mA 6.44 mA

5.13 mA

In an RC parallel circuit, ET = 208 V, R = 68 kΩ, and XC = 56 kΩ. What is the phase angle (angle theta)? 39.47° 44.56° 40° 50.53°

50.53°

In a series RC circuit, ET = 240 V, R = 500 W, and XC = 500 W. What is the true power?

57.62 W

Three capacitors, a 12 mF, a 20 mF, and a 30 mF, are connected in parallel to a 400 Hz source. The total XC is _____.

6.42 W

Three capacitors, a 12 μF, a 20 μF, and a 30 μF, are connected in parallel to a 400 Hz source. What is the total XC? 6.42 Ω 44.09 Ω 42.78 Ω 56.32 Ω

6.42 Ω

A series RC circuit has a resistance of 155 Ω and a capacitive reactance of 270 Ω. What is angle theta? 44.97° 60.14° 89.86° 55.03°

60.14°

A 35 mF capacitor is connected to a 60-Hz, 120 V supply. What is the XC of the capacitor? a. 75.79 Ω b. 80.33 Ω c. 83.2 Ω d. 93.43 Ω

75.79 Ω

A series RC circuit contains two resistors and two capacitors. The resistors are 39 W and 68 W. The capacitors have capacitive reactances of 60 W and 50 W. The applied voltage is 240 V. What is the voltage drop on the capacitor that has 50 W of reactance?

78.19 V

A series RC circuit contains two resistors and two capacitors. The resistors are 68 W and 56 W. The capacitors have capacitive reactances of 66 W and 33 W. The applied voltage is 240 V. What is the voltage drop on the 56 W resistor?

84.70 V

In an RC parallel circuit, the current flow through the capacitor will lead both the resistive current and applied voltage by _____. 360° 90° 60° 180°

90°

A series RC circuit contains two resistors and two capacitors. The resistors are 39 Ω and 68 Ω. The capacitors have capacitive reactances of 60 Ω and 50 Ω. The applied voltage is 240 V. What is the voltage drop on the capacitor that has 50 Ω of reactance? 260.99 V 178.2 V 93.84 V 106.35 V

93.84 V

A series RC circuit contains two resistors and two capacitors. The resistors are 39 W and 56 W. The capacitors have capacitive reactances of 80 W and 40 W. When calculating the circuit values, the total resistance used is _____.

95 W

When a capacitor is connected to a(n) _____ circuit, current appears to flow through the capacitor. a. DC b. AC

AC

Dividing a circuit's total applied voltage by the total impedance results in the total _____. VA current power VARs

current

The _____ of a circuit is the cosine of the phase angle. VARs power factor watts volt-amperes

power factor

The voltage rating of a capacitor _____. a. is a minimum working voltage b. should never be exceeded c. is only a suggested maximum d. can be exceeded as long as the time is under one hour

should never be exceeded

In a series RC circuit, ET = 240 V, R = 40 W, and XC = 30 W. What is EC?

144 V

In a series RC circuit, ET = 240 V, R = 150 W, and XC = 270 W. What is the reactive power?

163 VARs

In a series RC circuit, ET = 240 V, R = 150 Ω, and XC = 270 Ω. What is the reactive power? 190.56 VARs 126.48 VARs 163 VARs 253.56 VARs

163 VARs

What is the reactance of a 10 pF capacitor when the applied frequency is 30 Hz?

530.52 W

A capacitor that has an XC of 40 W is connected to a 60 Hz voltage. What is the value of the capacitor?

66.31 mF

Power factor (PF) is the ratio of the _____ power to the _____ power.

apparent, true

In an RC parallel circuit, the amount of phase angle shift depends on the ratio of the amount of _____. capacitance to voltage VARs to volt-amperes resistance to capacitance watts to volt-amperes

resistance to capacitance

What is the reactance of a 25 mF capacitor when the applied frequency is 400 Hz?

15.92 W

What is the reactance of a 25 μF capacitor when the applied frequency is 400 Hz? 16.12 Ω 11.59 Ω 10.61 Ω 15.92 Ω

15.92 Ω

In an RC parallel circuit, ET = 240 V, R = 10 kΩ, and XC = 8.2 kΩ. What is IC? 33.18 mA 44 mA 18.56 mA 29.27 mA

29.27 mA

In an RC parallel circuit, ET = 208 V, R = 42 kΩ, and XC = 47 kΩ. What is Z? 22.18 kΩ 19 kΩ 23.03 kΩ 31.32 kΩ

31.32 kΩ

In an RC parallel circuit, ET = 120 V, R = 3.6 kΩ, and XC = 5.6 kΩ. What is P? 5.57 W 6.16 W 7 W 4 W

4 W

In an RC parallel circuit, ET = 480 V, R = 50 kΩ, and XC = 47 kΩ. What is the reactive power? 6.38 VARs 5.36 VARs 4.90 VARs 7.61 VARs

4.90 VARs

Two capacitors, a 20 μF and a 30 μF, are connected in parallel to a 60 Hz source. What is the total capacitive reactance? 7.96 Ω 53.05 Ω 42.04 Ω 23.16 Ω

53.05 Ω

In a series RC circuit, ET = 240 V, R = 500 Ω, and XC = 500 Ω. What is the true power? 28.8 W 64.4 W 70.72 W 57.62 W

57.62 W

In an RC parallel circuit, ET = 240 V, R = 40 Ω, and XC = 30 Ω. What is IR? 6 A 4 A 4.8 A 3.42 A

6 A

In an RC parallel circuit, ET = 240 V, R = 4 kΩ, and XC = 3.3 kΩ. What is IR? 72.72 mA 46.28 mA 32.88 mA 60 mA

60 mA

In an RC parallel circuit, ET = 120 V, R = 40 Ω, and XC = 30 Ω. What is the power factor? 133% 60% 80% 100%

60%

Three capacitors, a 12 μF, a 20 μF, and a 30 μF, are connected in series to a 400 Hz source. What is the total XC? 42.78 Ω 36.42 Ω 52.09 Ω 66.32 Ω

66.32 Ω

You connect a clamp-on ammeter and a voltmeter to a series RC circuit powered by a 60-Hz circuit. The voltage reads 240 V and the current is 0.715 A. The resistor is 150 W. What is the true power?

76.68 W

In an RC parallel circuit, ET = 240 V, R = 40 Ω, and XC = 30 Ω. What is IC? 3.42 A 8 A 4.8 A 6 A

8 A

In a capacitive circuit, the voltage leads the current by 90 electric degrees.​ True False

True

Of the different power values in an RC circuit, which is known as apparent power?

VA

Of the different power values in an RC circuit, which is known as apparent power? W VA VARs

VA

Dividing a circuit's total applied voltage by the total impedance results in the total _____.

current

The capacitive reactance of a capacitor is _____ proportional to frequency. directly inversely

inversely

A 1 mF capacitor has 2,652 W of reactance at 60 Hz. How much is the reactance at 400 Hz?

397.88 Ω

In a circuit containing a capacitor, the impressed voltage is _____ with the applied voltage. 180° out of phase 90° out of phase 270° out of phase in phase

180° out of phase

In a series RC circuit, ET = 240 V, R = 40 W, and XC = 30 W. What is ER?

192 V

Two capacitors, a 20 mF and a 30 mF, are connected in series to a 400 Hz source. The total capacitive reactance is _____.

33.16 W

Two capacitors, a 20 μF and a 30 μF, are connected in series to a 400 Hz source. What is the total capacitive reactance? 33.16 Ω 53.05 Ω 7.96 Ω 42.04 Ω

33.16 Ω

Three capacitors, a 12 mF, a 20 mF, and a 30 mF, are connected in series to a 60 Hz source. The total XC is _____.

442.09 W

Three capacitors, a 12 μF, a 20 μF, and a 30 μF, are connected in series to a 60 Hz source. What is the total XC? 566.32 Ω 442.09 Ω 226.42 Ω 342.78 Ω

442.09 Ω

In an RC parallel circuit, ET = 120 V, R = 300 Ω, and XC = 400 Ω. What is P? 20.57 W 48.8 W 36 W 58 W

48.8 W

In an RC parallel circuit, ET = 120 V, R = 40 Ω, and XC = 30 Ω. What is IT? 6 A 7 A 5 A 8 A

5 A

A capacitor is connected to a 240 V supply. An ammeter indicates 3 A. What is the capacitive reactance of the capacitor? a. 23 Ω b. 30 Ω c. 71 Ω d. 80 Ω

80 Ω

When a capacitor is connected to a(n) _____ circuit, current appears to flow through the capacitor. AC DC

AC

In a series RC circuit, apparent power can be calculated by _____.

ET ´ I

A series RC circuit has two resistors and two capacitors. The resistors dissipate 9 W and 15 W. The capacitive powers are 18 VARs and 9 VARs. The applied voltage is 277 V. What is the circuit current? 130.4 mA 7.67 mA 7.67 A 130.4 A

130.4 mA

A series RC circuit contains two resistors and two capacitors. The resistors are 82 Ω and 47 Ω. The capacitors have capacitive reactances of 80 Ω and 50 Ω. What is the total impedance? 84.75 Ω 14.56 Ω 68.62 Ω 183.14 Ω

183.14 Ω

A series RC circuit contains two resistors and two capacitors. The resistors are 27 W and 56 W. The capacitors have capacitive reactances of 50 W and 40 W. Angle theta is _____.

47.31°

Two capacitors, a 20 mF and a 30 mF, are connected in parallel to a 400 Hz source. The total capacitive reactance is _____.

7.96 W

​In a series RC circuit, total impedance is a combination of resistance and capacitive reactance. True False

True

The power in a capacitor is reactive power. The unit of reactive power is the _____. a. VAR b. VA c. P d. W

VAR

The power in a capacitor is reactive power. What is the unit for reactive power? W P VA VAR

VAR

Power factor (PF) is the ratio of the _____ power to the _____ power. apparent; true true; apparent apparent; reactive reactive; apparent

apparent; true

In a series RC circuit, ET = 240 V, R = 30 W, and XC = 40 W. What is the apparent power?

1152 VA

In a series RC circuit, ET = 240 V, R = 30 Ω, and XC = 40 Ω. What is the apparent power? 921.6 VA 1152 VA 691.2 VA 168.2 VA

1152 VA

In an RC parallel circuit, ET = 277 V, R = 82 kΩ, and XC = 33 kΩ. What is the apparent power? 2.33 VA 2.93 VA 3.26 VA 2.51 VA

2.51 VA

In a series RC circuit, the resistor voltage is 124 V and the capacitor voltage is 167 V. What is the total voltage? 111 V 143 V 208 V 240 V

208 V

In a series RC circuit, the resistor voltage is 124 V and the capacitor voltage is 167 V. What is the value of the total voltage?

208 V

Two capacitors, a 20 mF and a 30 mF, are connected in series to a 60 Hz source. The total capacitive reactance is _____.

221.04 W

In an RC parallel circuit, ET = 120 V, R = 420 Ω, and XC = 330 Ω. What is Z? 534.13 Ω 230 Ω 140 Ω 259.62 Ω

259.62 Ω

Two capacitors, a 20 mF and a 30 mF, are connected in parallel to a 60 Hz source. The total capacitive reactance is _____.

53.05 W

A capacitor that has an XC of 40 Ω is connected to a 60 Hz voltage. What is the capacitance? 100.52 μF 99.48 μF 66.31 μF 75.80 μF

66.31 μF

Three capacitors, a 12 mF, a 20 mF, and a 30 mF, are connected in series to a 400 Hz source. The total XC is _____.

66.32 W

The symbol for capacitive reactance is _____. a. L b. XC c. XL d. C

XC

In a series RC circuit, ET = 240 V, R = 40 Ω, and XC = 30 Ω. What is EC? 144 V 37.14 V 62.86 V 92 V

144 V

Three capacitors, a 12 mF, a 20 mF, and a 30 mF, are connected in parallel to a 60 Hz source. The total XC is _____.

42.78 W

Three capacitors, a 12 μF, a 20 μF, and a 30 μF, are connected in parallel to a 60 Hz source. What is the total XC? 42.78 Ω 566.32 Ω 442.09 Ω 6.42 Ω

42.78 Ω

A series RC circuit contains two resistors and two capacitors. The resistors are 68 Ω and 56 Ω. The capacitors have capacitive reactances of 66 Ω and 33 Ω. The applied voltage is 240 V. What is the voltage drop on the 56 Ω resistor? 102.85 V 39.83 V 84.70 V 49.91 V

84.70 V

In an RC parallel circuit, ET = 277 V, R = 24 kΩ, and XC = 39 kΩ. What is the power factor? 92.41% 10% 61.54% 85.17%

85.17%

In an RC parallel circuit, the supply voltage is 120 V, 60 Hz. The resistance is 40 Ω and the capacitive reactance is 30 Ω. What is the capacitance of the capacitor? 53.05 μF 88.42 μF 66.31 μF 37.89 μF

88.42 μF

The unit of capacitive reactance is the _____. a. ohm b. coulomb c. henry d. farad

ohm

The _____ of a circuit is the cosine of the phase angle.

power factor

A series RC circuit contains two resistors and two capacitors. The resistors are 120 Ω and 470 Ω. The capacitors have capacitive reactances of 600 Ω and 300 Ω. When calculating the circuit values, what is the total capacitive reactance? 900 Ω 390 Ω 1000 Ω 1290 Ω

900 Ω

A series RC circuit contains two resistors and two capacitors. The resistors are 39 Ω and 56 Ω. The capacitors have capacitive reactances of 80 Ω and 40 Ω. When calculating the circuit values, what is the total resistance? 25 Ω 130 Ω 95 Ω 125 Ω

95 Ω

In a series RC circuit, apparent power can be calculated by _____. EC × I ER × I ET × I

ET × I

In an RC parallel circuit, the voltage across the resistor and the voltage across the capacitor are _____. in phase less than 90° out of phase with the resistor voltage lagging 180° out of phase less than 90° out of phase with the resistor voltage leading

in phase

The capacitive reactance of a capacitor is _____ proportional to frequency.

inversely

In a capacitor, the current _____ the applied voltage. a. is out of phase with b. is in phase with c. lags d. leads

leads

In a capacitor, the current _____ the applied voltage by _____. a. lags, 180° b. leads, 90° c. lags, 90° d. leads, 180°

leads, 90°