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electrical Flashcards

1
Q
  • phenomenon; manifestation
  • Principally made up of atoms (electron, proton, neutron)
A

Electricity

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2
Q

2 General Classes

A

Dynamic and Static

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3
Q

flow in an electric circuit

A

ELECTRIC CURRENT

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4
Q
  • Flows in one direction (- to +)
  • Uniform in strength
  • Battery/dry cell

2 types: continuous/pulsating (fluctuating)

A

DIRECT CURRENT (DC)

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5
Q
  • Reverses direction of flow at regular intervals
  • Reverses in direction
  • Frequency: 60 cps (60 Hertz)
  • Phase: SP/3P
  • 230VAC, 60Hz, SP
A

ALTERNATING CURRENT (AC)

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6
Q
  • Fixed polarity
  • Steady (continuous)
  • Varying in magnitude (fluctuating)
  • Steady value
  • Easier to MEASURE
  • 1.5 VOLTS
A

DIRECT CURRENT (DC)

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7
Q
  • Reverse Polarity
  • Varies between reversal
  • Stepped up or down
  • Easier to AMPLIFY
  • 110 VOLTS
A

ALTERNATING CURRENT (AC)

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8
Q

Path for electric current w/ EMF applied

A

ELECTRIC CIRCUIT

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9
Q

Force which causes movement of electricity in a conductor

A

Electromotive Force (EMF)

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10
Q

Electrical layout

A

Circuit Diagram

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11
Q

Broken, incomplete, disconnected

A

Open Circuit

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12
Q

Complete; Continuous path

A

Close Circuit

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13
Q

Bridging

A

Short Circuit

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14
Q

Circuit branching

A

Shunt

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15
Q

Relationship of EMF, Current, Resistance

A

OHM’s LAW

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16
Q

Current (Amperes)

A

I

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17
Q

EMF (Volts)

A

V

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18
Q

Resistance (Ohms)

A

R

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19
Q

EMF; pressure or force; Voltmeter

A

Voltage (Volts)

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20
Q

Inherent in wires (conductor); Ammeter

A

Amperes (Amps)

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21
Q

Current-carrying capacity (w/o undue heating)

A

Ampacity

22
Q

Friction; inherent in insulator/Ohmmeter

A

Ohms

23
Q

Does not consume electricity

A

DEVICE

24
Q

Rate of power; power consumption;

A

WATT

25
Q

Any one time

A

Watt Meter

26
Q

periodic; KWH Meter/

A

Watt-Hour Meter

27
Q

AC generator

A

ALTERNATOR

28
Q

M.E to E.E.

A

GENERATOR

29
Q

E.E. to M.E.

A

MOTOR

30
Q

Electrochemical; electrolysis

A

BATTERY

31
Q

Nonrenewable

A

Primary

32
Q

Lines that run along highways and major roads

1500+ customers restored

A

Ciscuit

32
Q

The source of electricity

A

Generating station

32
Q

Rechargeable

A

Secondary

32
Q

High voltage power lines that run cross country

25000+ customers restored

A

Transmission lines

32
Q

Distribute power to several circuits

Up to 6000 customers restored

A

Substation

33
Q

These serve smaller groups of customers and neighborhoods from the main circuits

50+ customers restored

A

Tap Lines

33
Q

Reduces power to usable voltage levels

1-8 customers restored

A

Individual Transformers

34
Q

Power supplied to a building through a service entrance. Three
heavy wires (drop), extend from utility poleoverhead wires are
fastened to the structure and spliced to service entrance wires that enter a conduit through a service head; rigid conduit must
be used

A

SERVICE ENTRANCE (SE - AERIAL)

35
Q

Three wires are placed in a rigid conduit. An underground
service conduit is brought to the meter socket. An USE includes
a watt- hour meter, main breaker, and lightning protection.

A

UNDERGROUND SERVICE ENTRANCE (USE)

36
Q

Offers low resistance

A

Conductors

37
Q

Prevents flow of electric current

A

Insulators

38
Q

Channel

A

Raceways

39
Q

Delivered through adistribution panel,or service panel.

A

SERVICE DISTRIBUTION

40
Q

READ

A

SYSTEM COMPONENTS OF BUILDING
Category 1. WIRINGS AND RACEWAYS
Conductors – offers low resistance
Insulators – prevents flow of electric current
Raceways - channel

Category 2. POWER HANDLING EQUIPMENTS
Transformer, Switchboard/Switchgear, Panel board, Service
Switch/Safety Switch, Circuit Breaker/Fuse
SERVICE DISTRIBUTION – delivered through adistribution panel,or service panel.

Category 3. UTILIZATION EQUIPMENTS – actual use
Fixtures, Switches, Convenience Outlets, Branch Circuits

41
Q

From the distribution panel, electricity is routed to the building
throughbranch circuits. Each circuit delivers electricity to a
limited number of outlets or devices and protected with acircuit
breaker.

A

BRANCH CIRCUITS

42
Q

Branch circuits are divided into three types by the PEC:

A

lighting circuits
small-appliance circuits
individual circuits

43
Q

underfloor raceway
- conventional installation
cellular metal floor raceway – rib decking/raised floor system
cellular concrete floor raceways – T-joist/ precast concrete slab with built in pipes

A

Floor Raceway

44
Q
  • Power and Control Tray
  • Cable (TC)
  • Busbar
  • Cable bus
A

Ceiling Raceway

45
Q

H-frame – 1000 kva
Cluster mounted – 225 kva
Pad mounted – 120V to 240V

A

Outdoor Transformers

46
Q

voltage to voltage

A

TRANSFORMER

47
Q

READ

A

Dry Type – pad mounted; switchboard

Askarel – synthetic non-flammable liquid

Oil-insulated – for transformer vault

Transformer Rating: stepped up/stepped down

bu (3 decks)

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