Electricity Flashcards
What are the three different sizes of main panel box?
100, 150, 200 AMPS
What tool should you use for removing and replacing fuses?
Fuse puller
What are the four main reasons for electrical shock?
Wear and tear
Defective construction
Misuse of equipment
Insulation failure
What are the five factors influencing the effect of an electric current passing through a human body?
Frequency (Low is worst) Current frequency Voltage Body contact resistance Internal body resistance
What are the two different ways to make electricity?
DC
AC
What is the Ohm’s Law?
P=E*I
What are the specificity of a grounding rod?
Diameter 1/2 inch
No less than 8 feet long
Must have 8 feet in ground below the permanent moisture level
What is bonding?
The permanent joining of metallic parts to form an electrically conducting path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed
What do we need to know for circuit calculations?
Wattage of each load
Amperes required
Voltage required
The distance from the service panel to the load
What causes voltage drop?
Wires too small for load being served
A circuit that is too long
Poor connection at the terminal
Conductors operating at high temperatures
What are the signs of voltage drop?
Dimming lights
What calculation rule could you use for planning ?purposes
Use 3 Watts per square foot
What colors are used for grounding wire?
Green
Copper
What colors are used for hot wire?
Red
Black
What color is used for neutral wire?
White
