Discharge of a Capacitor

Proportional

-Plate surface area -Dielectric constant

11. After one time constant, a discharging capacitor will have _____ percent of its initial charge.

37

12. After _____ time constant(s), a discharging capacitor is fully discharged.

5

The constant of proportionality between charge and voltage

Capacitance

The insulator between two capacitor plates

Dielectric

T/F

F-The voltage across a capacitor in an RC circuit increases linearly during charging

T/F

F-the dielectric constant indicates the distance by which the two plates of a capacitor are separated

13. The current in a charging capacitor in an RC circuit is present for a long time.

False

9. There is current in an RC circuit when the capacitor is fully charged.

False

One coulomb per volt

Farad

Inversely proportional

Plate separation

Contains a resistor and a capacitor

RC circuit

The measure of the difficulty required to push charges through a device

Resistance

T/F

T-A capacitor charges rapidly when connected to an RC circuit with a battery

T/F

T-One of the principle purposes of a capacitor is to store electric potential energy

T/F

T-The charge on a capacitor increase quickly at first, then much more slowly as the capacitor charges

T/F

T-a cylindrical capacitor is essentially a parallel-plate capacitor rolled into a tube

The characteristic time for a capacitor

Time constant

12. The internal resistance of the DMM is found by creating an RC circuit with a charged capacitor and the DMM set as a voltmeter.

True

7. When an RC circuit is closed without the battery, the capacitor _____.

begins discharing

1. The constant of proportionality between charge and voltage is the _____.

capacitance

1. A _____ is a device consisting of two conductors that can be charged with equal and opposite charges, separated by a thin insulator.

capacitor

4. A dielectric _____ the electric field between the two plates of a capacitor.

decreases

3. The insulator between the two plates of a capacitor is a _____.

dielectric

9. During _____, 37% of the maximum charge on a capacitor is present after one time constant.

discharging

8. The voltage in an RC circuit behaves like a(n) _____ function as the capacitor discharges.

expoential

2. The unit of capacitance is the _____.

farad

5. The amount of work required to separate the last two charges on a capacitor as it charges is _____ that of the first two charges.

greater than

15. As capacitance increases, the amount of charge the capacitor can hold _____.

increases

4. The presence of a dielectric in a capacitor _____ the capacitance of a capacitor.

increases

7. An ideal voltmeter has a resistance of _____ ohms.

infinite

3. The capacitance of a capacitor is _____ the plate separation of the capacitor.

inversely proportional to

11. The total charge on a capacitor is equal to capacitance _____ voltage.

multiplied by

10. The time constant of a capacitor in an RC circuit can be found by graphing the _____ against time.

natural log of voltage

5. Lightning is the result of electrical breakdown in the air when the _____ between the earth and a thundercloud exceeds that which the air can support.

potential difference

14. The capacitance of a capacitor is _____ to the plate area.

proportioanl

6. The larger the resistance of a resistor, the _____ the current that will pass through the resistor for a given voltage.

smaller

2. The capacitance of a capacitor depends on the _____ the capacitor.

surface area of

6. The way charge changes in time in an RC circuit is more important than the final charge on the capacitor.

true

8. A charged capacitor in an open circuit will remain charged indefinitely.

true