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ESW > PRELIM > Flashcards

PRELIM Flashcards

1
Q

Presence and flow of electric charge

A

Electricity

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2
Q

Electricity can be ________ or _________

A

Static or current

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3
Q

It is a stationary electric charge

A

Static

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4
Q

How does static electricity happen?

A

when there is an unbalanced charges

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5
Q

What is an unbalanced charge?

A

Losing or gaining electron

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6
Q

It is typically produced by friction, which causes sparks or crackling or the attraction of dust or hair

A

Static Electricity

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7
Q

Flow of charge particle

A

Current Electricity

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8
Q

In current electricity , what is moving?

A

Electrons

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9
Q

Mass of charges proton

A

1.672 X 10 ^ -27

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10
Q

Mass of charge electron

A

9.107 x 10 ^ -31

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11
Q

Center of atom

A

Nucleus

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12
Q

Where the protons and neutron located

A

Nucleus

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13
Q

Revolve around the orbits of valence shells around the nucleus

A

Electrons

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14
Q

It is an electrical property of the atomic particles of which matter consist, measured in coulombs (C).

A

Charge

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15
Q

How many electrons per 1 charge

A

1 C of charge = 6.25 x 1018 electrons

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16
Q

How to know if a body has charge ?

A

if it has either an excess or

deficit of electrons from its normal values.

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17
Q

3 major classes of electrical material

A

Conductor, semi-conductor, insulator

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18
Q

Material that has free electrons. Their electrons flow easily between atoms

A

Conductor

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19
Q

How many valence electron in outer orbit

A

1 - 3

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20
Q

have free electrons, but not as
many as conductors.
These materials have low
conductivities.

A

Semi - conductor

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21
Q

How many valence for semi-conductor ?

A

4

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22
Q

Object that does not
allow charge to flow.
Have very few free
electrons.

A

Insulator

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23
Q

5-8 valence electrons in

outer orbit

A

Insulators

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24
Q

Examples of insulators

A

Glass, mica, quartz

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25
Q

Examples of semi conductors

A

Germanium and silicon

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26
Q

Examples of conductors

A

Silver, copper, aluminum, Gold

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27
Q

a closed loop made of conductors and other electrical

elements through which electric current can flow

A

Electric circuit

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28
Q

Parts of electric circuit

A

Control, power source, conductors

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29
Q

Types of circuit

A

Short, Open and closed

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30
Q

Circuit that allows the

current follows the unintended path

A

Short circuit

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31
Q

Two circuit component

A

Active and Passive

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32
Q

Can generate power into a circuit and
are capable of electrically controlling and amplifying the flow of electrical current, whereas passive components cannot.

A

Active component

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33
Q

Component of a circuit that can either store or consume power but not electricity

A

Passive component

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34
Q

Example of Active Component

A 
Batteries
Power supply
Power transformers
Dynamos
Amplifiers
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35
Q

Example of Passive Component

A

Capacitors
Resistance
Transducer,
Inductor

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36
Q

is the
movement of electrons through a
conductive material.

A

Electricity

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37
Q

It refers to the number of
charges that move around a
circuit per second

A

Current

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38
Q

Ampere is named after

A

Andres M. Ampere

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39
Q

Formula of Ampere

A

I = Charge / time (C/s)

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40
Q

assumes that current flows out of
the positive side of the battery,
through the circuit, and back to the
negative side of the battery.

A

Conventional Current Flow

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41
Q

It flows out of the negative side of
the battery, through the circuit,
and back to the positive side of
the battery.

A

Electron Flow

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42
Q

It is a current that remains

constant with time.

A

Direct Current

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43
Q

Direct current flows only to ________

A

One direction

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44
Q

The normal
source of a DC electricity is
____________-

A

the dry cell or storage battery

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45
Q

it is the current that constantly reverses its direction of
flow.

A

Alternating Current

46
Q

What generates the Alternating Current?

A

Generator

47
Q

is the energy
required to move a unit
charge through an element
from one point to the other

A

Volts

48
Q

Formula of volts

A

J/C

49
Q

Volts is named after

A

Alessandro C. Volta

50
Q

Who invented the first Batteryy?

A

Alessandro C. Volta

51
Q

How many columbs in an electron or proton?

A

1.602 x 10 -19 coulombs

52
Q

is the opposition to the
current flow and at the same time
causing electrical energy to be
converted to heat energy

A

Resistance

53
Q

Ohms Law states that

A

It states that the current in a resistive circuit is directly proportional to
its applied voltage (I ∝ V) and inversely proportional to its resistance (I 1Τ∝ R)

54
Q

Unit of Power

A

Joules/sec

55
Q

Power is named after

A

James Watt

56
Q

Four (4) factors that affect the resistance of a

conductors

A

Length
temperature
Cross sectional Area
Resistivity (based on material)

57
Q

thinner the wire, greater the

A

thinner the wire, greater the resistance

58
Q

Formula of resistivity

A

pL/A

   cm
59
Q

area of a circle having a diameter (d) of one

mil.

A

CIRCULAR MIL (CM)

60
Q

How many mils in 1 inch

A

1000

61
Q

Formula of circular mils

A

diameter ^2

62
Q

a measure of the material’s ability to conduct electric

current.

A

Conductance

63
Q

What is the reciprocal of conductance

A

Resistance

64
Q

is a unit of conductance

A

Siemens

65
Q

Siemens was named after _________

A

Ernst Werner von Siemens

66
Q

Formula for siemens

A

Ampere / Volt

1/R

67
Q

How to calculate total resistance of series

A

R1 + R2 + R3 + R4

68
Q

How to calculate voltage of series

A

Vr1 + Vr2 + Vr3 = Vt

69
Q

How to calculate total resistance of Parallel

A

1/ (1/R1) + (1/R2) …

70
Q 
ON-ON switch
This switch can be ON in both 
positions, switching on a separate 
device in each case. It is often called 
a changeover switch.
A

SPDT Switch

71
Q

This type of switches is used for
controlling two different circuits at a
time.

A

Dpst switch

72
Q

Momentary switch - normally open.
This switch is in ON state when the
button is pressed otherwise it is in
OFF state.

A

Pushbutton switch

73
Q

Generates constant voltage.

A

DC Voltage

74
Q

Generates sinusoidal voltage.

A

AC Voltage

75
Q

Generates constant current

A

DC Current

76
Q

Generates sinusoidal current

A

AC Current

77
Q

Generates voltage that can vary the

magnitude.

A

Variable DC Current

78
Q

Measures voltage. Has very high

resistance. Connected in parallel

A

Voltmeter

79
Q

Measures electric current. Has near

zero resistance. Connected serially

A

Ammeter

80
Q

Measures electric power.

A

Wattmeter

81
Q

A device that measures the amount
of electric energy consumed by
a residence, a business, or an
electrically powered device

A

AC Watt-hour meter

82
Q

a device that can

transform electric energy into mechanical energy

A

Electric motor

83
Q

Generates light when current flows through.

A

Lamp/bulb

84
Q

Used for zero potential reference and electrical

shock protection.

A

Earth Ground

85
Q

device used on electrical
power systems and telecommunications systems
to protect the insulation and conductors of the
system from the damaging effects of lightning.

A

Lightning Arrester

86
Q

is where the wires connected to the load side of the

meter enter the house or building.

A

Service entrance

87
Q

is a component of an
electricity supply system that divides an
electrical power feed into subsidiary circuits,

A

Main distribution panel board

88
Q

Subscript letters indicate special variations

A

Special Purpose Outlet

89
Q

. Used to power
most of the electrical equipment you use in
your home on a daily basis, such as TVs,
fans, countertop kitchen appliances, and so

A

Duplex Convenience

90
Q

used in building construction
and consists of a square box or housing that
provides protection and a safety barrier for
electrical connections.

A

Junction Box

91
Q

it s the electrical cable that
carries power from the main circuit breaker panel
to the first electrical box, plug, or switch in
the circuit.

A

Circuit Homerun

92
Q

Three single pole switches on one switch plate

controlling one circuit of light per switch.

A

Triplex

93
Q

Two single pole switches on one switch plate

controlling one circuit of light per switch.

A

Duplex

94
Q

An electrical switch having two blades with their
contacts for simultaneous opening or closing
both sides of a circuit

A

Double Pole Switch

95
Q

An electric switch used in house wiring so that a
light may be turned on or off at three or more
places

A

4 way switch

96
Q

Change AC voltage from high to low or low to

high.

A

Transformer

97
Q

Coil / solenoid that generates magnetic field

A

Inductor

98
Q

Allows current flow in one direction only -

left (anode) to right (cathode).

A

Diode

99
Q

Allows current flow in one direction, but also
can flow in the reverse direction when above
breakdown voltage.

A

Zener diode

100
Q

a diode with low forward

voltage drop and it can switch rapidly.

A

Schottky Diode

101
Q

The capacitance
of this diode varies according to the applied
input voltage

A

Varactor / Varicap Diode

102
Q

Diode that can
switch very fast and can perform well in
microwave frequency range

A

Tunnel Diode

103
Q

a standard diode symbol with
two small arrows showing the emission of
light.

A

LED

104
Q

detects the light

energy and converts it into current or voltage

A

Photodiode

105
Q

Outputs 1 when input is 0

A

Not Gate

106
Q

Outputs 1 when both inputs are 1.

A

And Gate

107
Q

Outputs 0 when both inputs are 1.

A

NAND gate

108
Q

Outputs 1 when any input is 1.

A

Or Gate

109
Q

Outputs 1 when any input is 1.

A

Nor Gate

110
Q

Allows current flow when high potential at

base

A

NPN Bipolar Transistor

111
Q

Allows current flow when low potential at

base

A

PNP Bipolar

Transistor

ESW (4 decks)

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