ITEC 220 Test #1 Flashcards Preview

Module 4, Lesson 3 > ITEC 220 Test #1 > Flashcards

Flashcards in ITEC 220 Test #1 Deck (69):
1

Short circuit

An unintended path for current to flow which bypasses the intended devices

2

A three-wire line cord has one connector tied to chassis ground

True

3

Fuse

A protection device which overcurrent produces heat to melt a fusible element

4

Circuit breaker

A circuit interruption device that activates when an overcurrent is applied

5

Thermal overload

A protection device that opens when the ambient temperature rises above the rated value

6

Electromechanical relay

A switch that is activated by electromagnetism

7

If a fuse blows, replace it with a higher valued one

False

8

A fuse is what type of indicator

Circuit overload

9

An interlock or third-wire ground plug is an example of

Prevention protection

10

Schematic symbol

Drawings that represent components

11

Transducer

A device that changes one from of energy into another form

12

Atom

The smallest particle of an element

13

Proton

A heavy positive particle in the nucleus of an atom

14

Electron

A light negative particle orbiting the nucleus of an atom

15

Nucleus

The center of an atom. It consists of protons and neutrons

16

Neutron

A heavy particle, having no charge, found in the nucleus of an atom

17

Charge

The attraction and repulsion between particles

18

Element

A material that cannot be broken down by chemical reaction

19

Molecule

The smallest unit of a compound that has the same characteristics as the compound

20

Compound

A material whose molecules are the same

21

Shells/rings

The layers in which the electrons are found

22

The smallest particles into which an atom can be divided are called

Protons and electrons

23

An electron has a negative charge

True

24

Unlike charges repel each other

False

25

What is formed when two or more atoms of different elements are combined

A molecule

26

Valence electrons

The outermost electrons of an atom

27

Free electrons

Valence electrons that can move easily from atom to atom

28

Insulators

Compounds in which the bonding of the atoms prevent the valence electrons from becoming free electrons

29

Dielectrics

Insulators that help electrodes store charge

30

Conductor

Material whose atoms on the outer ring are less than half complete

31

Semiconductor

Element whose outer ring is half of electrons is exactly half complete

32

Resistance

The opposition to the movement of electrons in a conductive material

33

Ohm

The unit of electrical resistance (a current of 1 amp will flow when there is a potential difference of 1 volt across it.)

34

Mil

One-thousandth of an inch

35

Circular mils

Equal the square of the diameter expressed in mils

36

How many electrons are in the outer ring of atoms of semiconductor material

4 electrons

37

A conductor has (few,many) free electrons

Few

38

Static electricity

Refers to the electrical charge generated by friction

39

Coulomb

A unit of charge equal to the charge produced by 6.24 x 10 to the eighteenth

40

Potential difference

Difference between points A and B is the potential of B subtracted by A.

41

Volt

A unit of potential difference (can move 1 coulomb of charge while producing 1 unit of electrical work)

42

Joule

The unit of work energy

43

Electromotive force

The potential difference between the terminals of a device which can be a source of electrical energy

44

Current

The movement of electrical charge

45

Ampere

The unit of current

46

Conductance

The ability of a circuit to move electrical charges

47

Watt

The expenditure of one joule of energy in one second of time

48

What is the basic unit used to describe a difference of potential

Volt

49

Current defines a quantity of flow of electrons

True

50

Electrode

Electrical conductor by which current enters or leaves a medium such as an electrolyte.

51

Electrolyte

Any solution that conducts electric current

52

Anode

The negative terminal of a primary cell. The terminal where oxidation takes place

53

Cathode

The positive terminal of a primary cell

54

Battery

A voltage source which is usually a combination of electrochemical cells

55

Wet cell

Cell that has liquid electrolytes

56

Dry cell

Cell having the electrolyte in the form of a moist paste

57

Primary cell

A cell that converts chemical energy to electrical energy by an irreversible chemical reaction

58

Secondary cell

A cell that converts chemical energy into electrical energy, but the cell can be recharged

59

Five methods of generating voltage

Mechanical, chemical, static, thermal, and light

60

Why is a voltaic cell impractical to use

Because the charges have reached a state of equilibrium

61

What method of generating electricity is most widely used for home lighting and appliances

Mechanical

62

Piezoelectric effect

An effect in which electric polarization is produced by mechanical pressure

63

Thermocouple

A device consisting of two metals, one whose junction is kept at a fixed temp

64

What determines the amount of voltage generated by a solar cell

The intensity of the sun

65

What could a solar cell be used for

Satellites

66

What determines the amount of current generated by a thermocouple

Intensity of the heat applied

67

Possible applications of a thermocouple

Temperature control and monitoring inudstrial processes

68

What is piezoelectricity

Mechanical pressure of crystals that create an electrical charge

69

Resistor

Components designed to have specific numbers of ohms of resistance