AC - Unit 22

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

power factor

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

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

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

VA

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

current

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

144 V

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

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 = 500 W, and XC = 500 W. What is the true power?

57.62 W

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

192 V

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

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

apparent, true

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

reactances

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, apparent power can be calculated by _____.

ET ´ I

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

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°

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°

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

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