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