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88L10 > [Electrical Fundamentals] > Flashcards

[Electrical Fundamentals] Flashcards

1
Q

What is the opposition of current flow?

A

Resistance (R) Ohm

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2
Q

What are elements that transfer electrons very readily?

A

Conductors

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3
Q

What are formed when several cells are connected together to increase electrical output?

A

Batteries

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4
Q

What should be affixed to an affected circuit breaker or power source before starting any electrical work?

A

Red DANGER tag

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5
Q

What is voltage produced by pressure?

A

Piezoelectricity

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6
Q

What are needed to complete a circuit?

A
  • Power source
  • Load
  • Conductor
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7
Q

What is a reasonable precaution to take when making contact with energized electrical equipment?

A

Work with one hand if possible

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8
Q

What are the forces causing magnetization represented by?

A

Magnetic lines of force

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9
Q

What is produced when two dissimilar substances are immersed in a solution that produces a greater action on one substance than on the other?

A

Voltage by chemical action

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10
Q

When working on energized circuits, what should be tagged out at the nearest source of electricity for the component being serviced?

A

Power source

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11
Q

What is energy contained in an object because of its position?

A

Potential energy

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12
Q

Rules for parallel circuits

A
  • More than one path
  • Voltage - CONSTANT
  • Current - ADD
  • Resistance - LESS THAN LEAST
  • Power - SUM
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13
Q

How many valence electrons for conductors, semi-conductors, and insulators?

A
  • Conductors - Less than 3
  • Semi-conductors - 4
  • Insulators - 5-8
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14
Q

What is electricity at rest?

A

Electrostatics

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15
Q

What are two or more elements that are chemically combined that can be separated by chemical means, but not by physical means?

A

Compound

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18
Q

What should be done before working on de-energized equipment?

A

Discharge capacitors

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19
Q

What is the difference in potential between two bodies?

A

Electromotive force (EMF) or voltage

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20
Q

What are used to measure temperature and are used in heat-sensing devices in automatic temperature control equipment?

A

Thermocouples

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21
Q

What is a substance that cannot be reduced to a simpler substance by chemical means?

A

Element

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22
Q

What is the force that allows an electron to be available to be attracted to a positive ion?

A

Voltage (Volts - V)

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23
Q

What use magnets to convert mechanical motion into electrical energy?

A

Generators

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24
Q

What is the total number of magnetic lines of force leaving or entering the pole of a magnet?

A

Magnetic flux

Number of flux lines per unit area is called flux density

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25
Q

What is the smallest particle of an element that retains the characteristics of that element?

A

Atom

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26
Q

What is the property of material that enables it to attract to pieces of iron?

A

Magnetism

27
Q

What is the opposition to magnetic lines of force?

A

Reluctance

29
Q

Rules for series circuits

A
  • One path
  • Voltage - ADD
  • Current - CONSTANT
  • Resistance - ADD
  • Power - SUM
30
Q

What is anything that prevents or resists the maximum flow of electrons?

A

Resistance (Ohms)

32
Q

What is adding impurities to a semi-conductor?

A

Doping

33
Q

What use magnets to convert electrical energy into mechanical energy?

A

Electrical motors

34
Q

What flows when one coulomb of charge passes a point in one second?

A

Current of ampere

35
Q

What are the six ways to produce an EMF?

A
  • Friction
  • Pressure
  • Light
  • Heat
  • Chemical reaction
  • Magnetic induction (magnetism)
36
Q

What have an extremely high resistance to the flow of electrons?

A

Insulators

37
Q

What is a device that measures current?

A

Ammeter

38
Q

What is voltage produced by heating the joint where two unlike metals are joined?

A

Thermoelectricity

39
Q

What is the process by which an atom loses or gains electrons?

A

Ionization

40
Q

What is the quantity of electrons passing a specific point in a circuit in a given time period?

A

Current (Amperes - A)

41
Q

What are the lines that represent the field about a charged body?

A

Electrostatic lines of force

42
Q

What are the three methods for calculating resistance in a parallel circuit?

A
  • Like method
  • Product over sum
  • Inverse reciprocal method
43
Q

What is the ease with which magnetic lines of force distribute themselves throughout the material?

A

Permeability

44
Q

What is the directed flow of electrons?

A

Electric current

45
Q

What is the space surrounding a magnet where magnetic forces act?

A

Magnetic field

46
Q

What law states: “Charged bodies attract or repel each other with a force that is directly proportional to the product of their individual charges and is inversely proportional to the square of the distance between them.”

A

Coulomb’s Law

47
Q

What is the product of force and displacement?

A

Work

48
Q

Who are tags signed by?

A

Chief engineer

49
Q

What are the three general classifications of magnets?

A
  • Bar
  • Ring
  • Horseshoe (most frequently used)
50
Q

What are the three things needed for magnetic induction?

A
  • Conductor
  • Magnetic field
  • Relative motion
51
Q

What is anything that occupies space?

A

Matter

52
Q

What is a combination of two or more elements, one of which must be metal?

A

Alloy

53
Q

What is the best conductor?

A

Silver

54
Q

What is energy contained in an object due to its motion?

A

Kinetic energy

55
Q

What is the ability to do work?

A

Energy

56
Q

What is the amount of magnetism that remains in a temporary magnet?

A

Residual magnetism

57
Q

Quay are the two classifications if artificial magnets?

A
  • Temporary

* Permanent

58
Q

What is the space between and around charged bodies?

A

Electric field of force

59
Q

What is the choice for fighting electrical fires?

A

CO2

60
Q

What is a combination of elements and/or compounds that are not chemically combined and that can be separated by physical means?

A

Mixture

60
Q

What is any particle that is a chemical combination of two or more atoms?

A

Molecule

60
Q

What is anything between a conductor or insulator?

A

Semiconductor

88L10 (22 decks)

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