ITEC 271 Final Flashcards Preview

Module 4, Lesson 3 > ITEC 271 Final > Flashcards

Flashcards in ITEC 271 Final Deck (44):
1

Electrical safety problems

Fires, burns, and death

2

Death can occur in two ways

Direct (electrocution) and indirect (falls)

3

Causes of electrical safety problems

Lack of knowledge, can't see it, one of the most common in construction

4

9 -10 house fires are what kind of fires

Electrical fires

5

Voltage represents

Volts - electromotive force

6

Current represents

Amps - intensity

7

Resistance represents

Ohms - resistance

8

Is current or voltage the killer

Current is the killer

9

Electrical system comparison to a water system

Voltage = pressure (P.S.I), current = Quantity (G.P.M.), and resistance = nozzle on the hose

10

Define conductor

Carry electricity

11

Define Insulator

Does not carry electricity (high resistance)

12

Define circuit

Must be complete path for current to travel in

13

5 factors affecting extent of harm

1. Amount of current (amps) 2. Path of current 3. Length of time 4. "Grounding" can eliminate the problem

14

Path of current characteristics

Finger to finger = minimal hazard and arm to arm/arm to leg = heart muscles being affected

15

Length of time characteristics

1-2 seconds can cause the heart harm, remove victim from the source, remove source from the victim, DO NOT touch the victim (use a stick), and begin CPR

16

A ground example

3-prong adapter

17

Current through a resistance generates what

Heat (internal burns)

18

Turn off power at

Switch box or fuse box

19

Capacitors perform what function

Store current

20

How man hands should be used when replacing fuses

1 hand, use rubber mats, and insulated tools (fuse pullers)

21

Rings and watches are considered what `

Conductors

22

Prevention characteristics

All wiring should be to N.E.C. standard, plug items direct (no extension cords), observe insulation on wire, lock fuse boxes during repair, and grasp plug, not cord

23

The longer the extension cord......

The larger the wire (no insulation)

24

Plugs are the most common what

Problem

25

Which side of an outlet is the hot side

The smaller slot that is represented by gold screws

26

Which color wire attaches to the hot side

Black wire

27

What wire connects to the silver screws of the larger slot

White wire

28

A 3-way switch might have this type of wire

Common wire

29

Ceramic fixture characteristics

It does not matter where you hook the white and black wires

30

Limn Pliers characteristics

Used to cut romex and sheath wiring

31

Wire stripper characteristics

Used to strip romex and contain labeling for exact wire gauge

32

Electrical box characteristics

Round boxes are used for lighting fixtures and a square boxes are used for switches or outlets

33

How does DC current flow

In one direction

34

Types of AC current

Single-phase and three phase

35

Single-phase is used in what apps

Residential apps

36

Three phase occurs every

60th of a second (pushing of electricity)

37

120 volts

15, 20 amps, wire size 14, 12

38

15 A operates

Lights

39

20 A operates

kitchen

40

240 Volts

30, 40, 50 A and wire size 10, 8, 6

41

30 A operates

Stove

42

40 A operates

Water heater

43

50 A operates

Dryer

44

480 Volts

Wire size 4, 2, 0, 00, 000, 0000