Delmars Unit 19 Capacitors
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? 2.3 s 4.3 s 1.8 s 3.8 s
1.8 s
Two capacitors, a 20 μF and a 30 μF, are connected in series. What is the total capacitance? 50 μF 12 μF
12 μF
Two capacitors, a 20 μF and a 30 μF, are connected in parallel. What is the total capacitance? 50 μF 12 μF
50 μF
Three capacitors, a 12 μF, a 20 μF and a 30 μF, are connected in series. What is the total capacitance? 62 μF 6 μF
6 μF
Three capacitors, a 12 μF, a 20 μF and a 30 μF, are connected in parallel. What is the total capacitance? 62 μF 6 μF
62 μF
When a capacitor is connected in a circuit with a resistor, the amount of time needed to charge the capacitor is called the _____. RC time variable CR time constant RC time constant CR time variable
RC time constant
What is a device that opposes a change of voltage? an inductor a capacitor a diode
a capacitor
Nonpolarized capacitors _____. can be used with either AC or DC must be used with AC only must be used with DC only
can be used with either AC or DC
A HIPOT is a test set used to test capacitor _____. dielectric leads capacitance tolerance
dielectric
The material between a capacitor's plates is rated by a value called the _____. magnetic constant dielectric variable magnetic variable dielectric constant
dielectric constant
Polarized capacitors are also known as _____ capacitors. bipolar electrolytic electroplated variable
electrolytic
Energy in a capacitor is stored as a(n) _____. electromagnetic field circulating current magnetic field electrostatic charge
electrostatic charge
What is the basic unit of capacitance? farad henry ohm coulomb
farad
A charge curve for a capacitor is divided into _____ time constants. two three four five
five
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. leakage electrostatic electrolytic conduction
leakage
Polarized capacitors _____. must be used with AC only can be used with either AC or DC must be used with DC only
must be used with DC only
A capacitor is constructed by separating two metal conductors known as _____ with an insulating material known as a(n) _____. dielectrics; plate ceramics; electrolyte electrolytes; ceramic plates; dielectric
plates; dielectric
What letter symbolizes the farad? C Q F V
F
In a capacitor, the voltage difference between the plates controls the _____. amount of dielectric stress amount of current flow through the capacitor area of the plates thickness of the dielectric
amount of dielectric stress
Increasing the surface area of the plates will cause the capacitance of a capacitor to _____. stay the same decrease increase
increase
The _______________ indicates the amount of capacitance change with temperature.
temperature coefficient
In a capacitor, the amount of dielectric stress is proportional to the _____. thickness of the dielectric voltage difference between the plates current flow through the capacitor distance between the plates
voltage difference between the plates
