ITEC 271 Final Flashcards
Electrical safety problems
Fires, burns, and death
Death can occur in two ways
Direct (electrocution) and indirect (falls)
Causes of electrical safety problems
Lack of knowledge, can’t see it, one of the most common in construction
9 -10 house fires are what kind of fires
Electrical fires
Voltage represents
Volts - electromotive force
Current represents
Amps - intensity
Resistance represents
Ohms - resistance
Is current or voltage the killer
Current is the killer
Electrical system comparison to a water system
Voltage = pressure (P.S.I), current = Quantity (G.P.M.), and resistance = nozzle on the hose
Define conductor
Carry electricity
Define Insulator
Does not carry electricity (high resistance)
Define circuit
Must be complete path for current to travel in
5 factors affecting extent of harm
- Amount of current (amps) 2. Path of current 3. Length of time 4. “Grounding” can eliminate the problem
Path of current characteristics
Finger to finger = minimal hazard and arm to arm/arm to leg = heart muscles being affected
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
A ground example
3-prong adapter
Current through a resistance generates what
Heat (internal burns)
Turn off power at
Switch box or fuse box
Capacitors perform what function
Store current
How man hands should be used when replacing fuses
1 hand, use rubber mats, and insulated tools (fuse pullers)
Rings and watches are considered what `
Conductors
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
The longer the extension cord……
The larger the wire (no insulation)
Plugs are the most common what
Problem
