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