Unit 19,20,21,22
1.8 s
A 100 μF capacitor and a 3.6 k Ω resistor are connected in series. How long will it take for the capacitor to change its charge completely?
plates; dielectric
A capacitor is constructed by separating two metal conductors known as _____ with an insulating material known as a(n) _____.
Five
A charge curve for a capacitor is divided into _____ time constants.
exponential rate
Capacitors charge and discharge at a(n) _____ rate.
Capacitive Reactance
Countervoltage presented by a capacitor is called _____.
Electrostatic charge
Energy in a capacitor is stored as a(n) _____.
180 degrees out of phase
In a circuit containing a capacitor, the impressed voltage is _____ with the applied voltage.
AC or DC
Nonpolarized capacitors _____.
military
The JAN standard is used to mark a capacitor intended for _____.
Capacitor
What is a device that opposes a change of voltage?
Farad
What is the basic unit of capacitance?
F
What letter symbolizes the farad?
True
In a series RC circuit, total impedance is a combination of resistance and capacitive reactance.
False
In a capacitive circuit, the voltage leads the current by 90 electric degrees.
Voltage difference between plates
In a capacitor, the amount of dielectric stress is proportional to the _____.
Amount of dielectric stress
In a capacitor, the voltage difference between the plates controls the _____.
Leads, 90 degrees
In a pure capacitive circuit, the current _____ the applied voltage by _____.
resistance and capacitance
In an RC parallel circuit, the amount of phase angle shift depends on the ratio of the amount of _____.
90 degrees
In an RC parallel circuit, the current flow through the capacitor will lead both the resistive current and applied voltage by _____.
In phase
In an RC parallel circuit, the voltage across the resistor and the voltage across the capacitor are _____.
leakage
In some capacitors, there is a small amount of current that flows from one plate, through the dielectric material to the other plate. This current is called _____ current.
Increase
Increasing the surface area of the plates will cause the capacitance of a capacitor to _____.
DC only
Polarized capacitors _____.
electrolytic
Polarized capacitors are also known as _____ capacitors
Apparent; true
Power factor (PF) is the ratio of the _____ power to the _____ power
Power Factor
The _____ of a circuit is the cosine of the phase angle.
Temperature coefficient
The _______________ indicates the amount of capacitance change with temperature.
inversely
The capacitive reactance of a capacitor is _____ proportional to frequency.
dielectric constant
The material between a capacitor's plates is rated by a value called the _____.
VAR's
The power in a capacitor is reactive power. What is the unit for reactive power?
R/XC
The quality of a capacitor is found by Q = _____.
Should NEVER be exceeded
The voltage rating of a capacitor _____
62 μF
Three capacitors, a 12 μF, a 20 μF and a 30 μF, are connected in parallel. What is the total capacitance?
6 μF
Three capacitors, a 12 μF, a 20 μF and a 30 μF, are connected in series. What is the total capacitance?
50 μF
Two capacitors, a 20 μF and a 30 μF, are connected in parallel. What is the total capacitance?
12 μF
Two capacitors, a 20 μF and a 30 μF, are connected in series. What is the total capacitance?
air
Variable capacitors normally have a dielectric of _____.
XC
What is the symbol for capacitive reactance?
Ohm
What is the unit for capacitive reactance?
RC time constant
When a capacitor is connected in a circuit with a resistor, the amount of time needed to charge the capacitor is called the _____.
AC
When a capacitor is connected to a(n) _____ circuit, current appears to flow through the capacitor.
Opposite
When the voltage and current have _____ polarities in a pure capacitive circuit, the capacitor is discharging and the energy is returned to the circuit.
current
Dividing a circuit's total applied voltage by the total impedance results in the total _____.
Dielectric
A HIPOT is a test set used to test capacitor _____.
