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Electrical first year > D1 > Flashcards

D1 Flashcards

0
Q

Anything that occupies space or has mass is referred to as

A

Matter

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1
Q

A substance that is made up of more than one type is a

A

Compound

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2
Q

The atomic number of an element refers to the number of _____ in the ____ of an atom

A

Protons, nucleus

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3
Q

The maximum number of electrons allowed in Valence orbit.

A

8

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4
Q

In orbits farther from the nucleus, the energy possessed by electrons

A

Increases

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5
Q

An electron that has broken loose from its atom is a

A

Free electron

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6
Q

Semiconductors contain ____ valence electrons.

A

Four

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7
Q

Most metals are good

A

Conductors

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8
Q

The smallest independent portion that a substance can be broken down to is a

A

Molecule

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9
Q

The smallest portion an element can be broken into

A

Atom

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10
Q

Negative charge is called

A

Anion

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11
Q

Positive charge is called

A

Cation

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12
Q

The first Law

A

Like charges repel an unlike charges attract

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13
Q

The force between two charges at rest is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them.

A

Coulomb’s Law

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14
Q

Each atom shares its valence electrons with others around it

A

Is a Metallic Bond

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15
Q

An atom that has a positive charge possess _____ electrons then protons

A

Fewer

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16
Q

Like charges ____ and unlike charges _____

A

Repel and attract

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17
Q

Electrostatic charge becomes a hazard

A

Lightening and fuel handling

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18
Q

The body can receive an electrostatic charge by

A

Friction (contact)
Conduction
Induction

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19
Q

Electrons flow ____ to ____

A

(-) to (+)

Negative to positive

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20
Q

A force that acts at a distance with no contact

A

A Field force

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21
Q

____ refers to the charge at one point with respect to another

A

Polarity

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22
Q

Two dissimilar materials rubbed together is the _____ effect

A

Triboelectric effect

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23
Q

The work per unit charge done by a source of energy on electric charges, to move them against an electric field.

A

Electromotive Force (emf)

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24
Piezoelectric effect aka
Pressure
25
Electrochemical effect aka
Chemical ---> battery
26
Thermoelectric effect aka
Heat
27
Thermocouples used in series is called?
Thermopile
28
Light | Extra energy causes the electrons to leave their atoms, and current to flow.
Photovoltaic effect
29
Name of the device which uses the photovoltaic effect
Photovoltaic cell
30
Magnetoelectric effect aka
Magnetism
31
The law of the conservation of energy is
Energy may neither be created or destroyed
32
6.24 X 10^18 is referred to as a
Coulomb
33
The term used to represent opposition to current flow in a circuit
Resistance
34
Charge
Q Coulomb C
35
Power
P Watt W
36
Resistance
R Ohm Upside down horseshoe
37
Energy emf units
E Volt V
38
Current units
I Ampere A
39
Why diagram is easiest to understand for a person with little knowledge of electricity is a ____ diagram.
Pictorial
40
A schematic diagram that shows power source as two vertical lines on either side is a ____ diagram
Ladder
41
Difference between block diagram components and one-line diagram components.
Block diagram uses blocks. | One line diagram uses symbols.
42
Schematic diagrams do not show
The physical relationship. But rather the electrical relationship.
43
Type of diagram where components are shown as they appear are _____ diagrams
Pictorial
44
The flow chart style is the ____ diagram.
Block.
45
Circuit map is a _____ type of diagram.
Wiring.
46
Diagram with a three-dimensional component view is a ____ diagram.
Pictorial
47
Does not show the individual conductors is a ____ diagram.
One-line or Block
48
A device that changes electrical energy into other forms of energy is
a Load
49
Define a short circuit
A parallel path of low resistance.
50
Two types of damage due to high current
Thermal and Mechanical
51
Current flows through a load from____ to ____
Negative to positive | -) to (+
52
A charge at one point with respect to another.
Polarity
53
How does a fuse or breaker protect from excessive current.
It creates an opening in the circuit
54
When a switch is open it is____
Off
55
Current flows through a power SOURCE from ____ to _____
Positive to negative | +) to (-
56
Source, load and conductors are
The three necessary components to a circuit.
57
To stop the load the switch must be____
Open
58
why are resistors used
Creating heat Regulating voltage Controlling Current
59
resistors are rated in
ohms and watts
60
three types of resistors
wire-wound film resistor carbon composition
61
Carbon composition has the ___watts rating
lowest
62
Adjustable resistors are normally ___type
wire-wound
63
More common name for an Edison fuse
plug fuse
64
What was the fault with edison fuses
they could be replaced with one of a higher amperage
65
A circuit breaker can operate on ___ or____
thermal or magnetic action
66
knife blade fuses are used when the Amperage is in excess of
60A
67
Trip- free means what?
that one can not hold the Breaker in the closed position once the circuit is tripped.
68
CEC classes low voltage as
31V - 750V
69
DRT cable is used for
ranges and dryers
70
bus bars determine the ___rating of distribution panels
Amperage
71
general service cables are common for
hard usage type for portable equipment
72
each circular mil is = to ___square mils
0.7854
73
Copper or aluminum which has the lower resistance
Copper
74
R of Alumium = R of copper
x 1.64 | so 10 ohms of copper x1.64 = 16.4 ohms aluminum
75
5 factors that determine amps/ current flow in a conductor
``` type of conductor material size Insulation type Ambient temperature method of insulation. ```
77
Atoms become stable if they have 8 electrons in their valence orbit. This is called
A Stable Octet
78
Kirchhoff's voltage law states that :
the sum of all voltages across resistors or loads is equal to the applied voltage
79
_________ cannot be recharged, while ___________ can be recharged.
Primary cells, secondary cells
80
Connecting cells in series (- to +) increases their ________, while connecting them in parallel (- to - and + to +) increases their
voltage rating, current rating
81
The basic meter movement used for many analog instruments is.
the moving-coil galvanometer, or the D'Arsonval movement
82
Voltage is measured in | Current is Measured in (devices)
Parallel | Series

Electrical first year (9 decks)

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