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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?

27
What is the opposition to magnetic lines of force?
Reluctance
29
Rules for series circuits
* One path * Voltage - ADD * Current - CONSTANT * Resistance - ADD * Power - SUM
30
What is anything that prevents or resists the maximum flow of electrons?
Resistance (Ohms)
32
What is adding impurities to a semi-conductor?
Doping
33
What use magnets to convert electrical energy into mechanical energy?
Electrical motors
34
What flows when one coulomb of charge passes a point in one second?
Current of ampere
35
What are the six ways to produce an EMF?
* Friction * Pressure * Light * Heat * Chemical reaction * Magnetic induction (magnetism)
36
What have an extremely high resistance to the flow of electrons?
Insulators
37
What is a device that measures current?
Ammeter
38
What is voltage produced by heating the joint where two unlike metals are joined?
Thermoelectricity
39
What is the process by which an atom loses or gains electrons?
Ionization
40
What is the quantity of electrons passing a specific point in a circuit in a given time period?
Current (Amperes - A)
41
What are the lines that represent the field about a charged body?
Electrostatic lines of force
42
What are the three methods for calculating resistance in a parallel circuit?
* Like method * Product over sum * Inverse reciprocal method
43
What is the ease with which magnetic lines of force distribute themselves throughout the material?
Permeability
44
What is the directed flow of electrons?
Electric current
45
What is the space surrounding a magnet where magnetic forces act?
Magnetic field
46
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.”
Coulomb’s Law
47
What is the product of force and displacement?
Work
48
Who are tags signed by?
Chief engineer
49
What are the three general classifications of magnets?
* Bar * Ring * Horseshoe (most frequently used)
50
What are the three things needed for magnetic induction?
* Conductor * Magnetic field * Relative motion
51
What is anything that occupies space?
Matter
52
What is a combination of two or more elements, one of which must be metal?
Alloy
53
What is the best conductor?
Silver
54
What is energy contained in an object due to its motion?
Kinetic energy
55
What is the ability to do work?
Energy
56
What is the amount of magnetism that remains in a temporary magnet?
Residual magnetism
57
Quay are the two classifications if artificial magnets?
* Temporary | * Permanent
58
What is the space between and around charged bodies?
Electric field of force
59
What is the choice for fighting electrical fires?
CO2
60
What is a combination of elements and/or compounds that are not chemically combined and that can be separated by physical means?
Mixture
60
What is any particle that is a chemical combination of two or more atoms?
Molecule
60
What is anything between a conductor or insulator?
Semiconductor

88L10 (22 decks)

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