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What is the reactive power
6.8 mW
15.8 mW
9.8 mW
12.8 mW
What is the voltage across the capacitor
111 mV
7.07 mV
1.11 V
7.07 V
Which of the following determines the capacitance of a capacitor
Plate area, dielectric constant, and plate separation
Temperature coefficient, plate area, and plate separation
Plate area, dielectric strength, and plate separation
Voltage rating, dielectric constant, and temperature coefficient
What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant
63 V
37.8 V
101 V
38 V
Select the equation below that represents the relationship between charge, capacitance, and voltage for a capacitor
Q = CV
C = QV
V = IR
The strength of an electric field at a given point is proportional to the potential difference on the plates and inversely proportional to the
negative plate only
plate separation
charge difference
field strength
Power stored from the source and then returned to the source is called
true power
reactive power
Impedance power
apparent power
If the reactive power of a circuit is 50 mW while the apparent power is 64 mW, then what is the true power of the circuit
40 mW
114 mW
36 mW
14 mW
What will a 1 F capacitor store
one volt
one coulomb of charge
one A of current
6.24 x 1012 electrons
How long would it take the capacitor in the given circuit to completely charge if the switch was in position 1
22 ms
440 ms
345 ms
69 ms
What circuit has the following frequency response
bandpass filter
low-pass filter
integrator
high-pass filter
What is the impedance of an ac RC parallel circuit if the resistance is 12 ohms and the capacitive reactance equals 5 ohms
0.2 ohms
13 ohms
4.6 ohms
3.5 ohms
What do variable capacitors use for dielectric
ceramic, electrolytic, mica, or paper
ceramic, paper, plastic, or mica
air, ceramic, mica, or plastic
mica, ceramic, plastic, or electrolytic
The rate of charge or discharge of a capacitor is based on ___ function
a parabolic
a linear
an exponential
a trigonometric
Capacitive reactance values connected in series offer
an increase in total XC
no change in total XC
total opposition to voltage in the circuit
a decrease in total XC
After a capacitor has charged for 1 tc, what percentage of current remains in the resistor
63.2
36.8
5.0
13.5
In a 20 Vac series RC circuit, if 20 V is measured across the resistor and 40 V is measured across the capacitor, the applied voltage is
55 V
50 V
45 V
60 V
A capacitor takes ___ time constants to charge to 95% of its capacity
2
3
5
4
After which time constant can a capacitor be considered to be fully charged
First
Seventh
Third
Fifth
In an RC circuit, true power (PR) equals
VS × I
I2R
VT × RT
1
2
3
5
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