Delmar Ch 19-22
Plates; Dielectric
A capacitor is constructed by separating two metal conductors known as ______ with a insulating material called a _____.
5
A charge curve for a capacitor is divided into how many time constants?
inversely
Capacitive Reactance is ______ proportional to frequency.
Capacitive Reactance
Counter Voltage presented by a capacitor is called....
voltage difference between plates
In a capacitor, the amount of dielectric stress is proportional to the....
90 deg.
In a pure capacitive circuit, the current LEADS applied voltage by.....
increase
Increasing the surface area of the plates will cause the capacitance of a capacitor to....
AC/DC circuits
Nonploraized capacitors can be used by.....
resistance to capacitance.
Phase angle shift depends on...
dielectric
The HIPOT test is used to test a capacitor's.....
Farad (C)
What is the basic unit of capacitance?
F
What letter symbolizes the farad? hint: not "C"
electrostatic charge
Energy in a capacitor is a(n)....
amount of dielectric stress
In a capacitor the voltage difference between the plates controls the....
180 deg. out of phase
In a circuit containing a capacitor, the IMPRESSED voltage is______ with APPLIED voltage.
90 deg
In an RC circuit the current will lead the resistive current and voltage by.....
In phase
In an RC parallel circuit voltage across the resistor and capacitors 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....
electrolytic capacitors
Polarized capacitors are also known as....
DC curcuits only
Polarized capacitors must be used by....
true; Apparent
Power factor is the ratio of _____ to ______ powers.
Q=R/XC
Quality of a capacitor is found with what equation?
false
T/F, In a capacitive circuit, the voltage leads the current by 90 deg?
VAR (Volt-Amp-Reactance)
The "power" in Reactance is not labels as watts but instead....
Military
The JAN standard is used to mark a capacitor intended for....
Stripes
The ______ indicates the amount of capacitance change with temperature.
dielectric constant
The material between a capacitors plates is rated by a value called the.....
never to be exceeded
The voltage rating of a capacitor is......
air
Variable capacitors normally have a dielectric of....
Capacitor
What device opposes a change of voltage.
C=1/2PiHzXc
What equation do you use to find Capacitance assuming frequency and reactance are known?
1/2piHzC
What equation do you use to find reactive capacitance assuming you know frequency and capacitance?
Xc
What is the symbol for Capacitive reactance?
Ohmns
What is the unit of measure for Capacitive Reactance?
opposite
When a capacitive circuit has the voltage and amps in ______ polarities, the capacitor is discharging.
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 ______ circuit, current appears to flow through the capacitor.