PHEP 16

Question 1

what is capacitance

Answer 1

that property which opposes any change in voltage

Question 2

what is inductance

Answer 2

that property that opposes any change in current

Question 3

what are the units of capacitance

Answer 3

farrads

Question 4

what affects capacitance of a capacitor

Answer 4

area of plate, distance between plates, number of plates

Question 5

what is capacitive reactance

Answer 5

opposition offered by a capacitance to the flow of A-C

current through a capacitor and is expressed in Ohms.

Question 6

what will happen to the charging current in a capacitor if an alternating voltage is applied

Answer 6

vary as voltage changes

Question 7

what is the unit used in measuring the size of a capacitor

Answer 7

farrad

Question 8

What is the purpose of of insulation, or an insulator?

Answer 8

To prevent leakage or loss of current.

Question 9

A dielectric is an insulator that is placed _____________.

Answer 9

Between two conductors

Question 10

Define Capacitor

Answer 10

Any two conductors which are separated by an insulator and designed to introduce capacitance within a circuit.

Question 11

Describe dielectric strength.

Answer 11

IT’S A MEASURE OF THE INSULATING PROPERTY OF THE MATERIAL.

Question 12

Describe dielectric constant.

Answer 12

IT’S A MEASURE OF AN INSULATORS EFFECTIVENESS.

Question 13

How do you measure dielectric strength?

Answer 13

It’s the VOLTAGE PER CENTIMETER that must be applied to rupture or breakdown an insulator.

Question 14

What is the constant used to determine a dielectric’s effectiveness?

Answer 14

The constant is air, which has a value of 1.

Question 15

What are the three ways charging current can be increased in a capacitor?

Answer 15

1. Voltage is increased
2. Size of the plates are increased.
3. The plates are moved closer together.

Question 16

The capacitance in farads is numerically equal to the quantity of electricity in _______.

Answer 16

Coulombs

Question 17

The intensity of the electrostatic field is proportional to?

Answer 17

the voltage between conductors.

Question 18

The electrostatic field is proportional to the ________ and the magnetic field is proportional to the ______ carried.

Answer 18

Voltage,

Current.

Question 19

What is considered when constructing parallel-plate capacitors?

Answer 19

The amount of voltage they are to be subjected to.

Question 20

Capacitance is proportional to?

Answer 20

the cross-sectional area of the dielectric between the plates.

Question 21

Total capacitance in a parallel circuit is?

Answer 21

Additive

Question 22

Total capacitance in a series circuit is?

Answer 22

Reciprocal of the reciprocal.

Question 23

What are some capacitor applications?

Answer 23

1. To smooth voltage ripples in D-C circuits.
2. Minimize contact burning in inductive circuits.
3. Supply energy to lightning impulse generators.

Question 24

Capacity is a measure of the _______ of a capacitor to store electrons.

Answer 24

Ability