Chapter 10: Residential Electrical
o 120 V AC nominal voltage at outlets
o Devices and appliances rated at 110 V or 115 V AC to accommodate voltage drop in
Plug: Carries electricity to devices
o Hot blade: smaller blade, bla
Chapter 11: Commercial Electrical
Conduit: Pathway for wiring that protects conductors and can serve as the ground conductor (if
it is metal). Duplex and lighting circuits in residential and commercial are similar, but instead of
NM cable, conduit is used
Chapter 3: Lamps
Efficacy: The number of lumens produced per watt of electricity. A standard 100 watt incandescent lamp
produces about 1750 lumens, which is an efficacy of 17.5 lumens/ watt. The maximum theoretically
efficacy is 680 lumens/ watt.
Chapter 7: Lighting Numbers
S/MH Ratio: The spacing to mounting height ratio. For a S/MH of 2, and the work surface in 7ft below
the luminaire (fixture) the maximum spacing is 14ft.
Coefficient of Utilization: Percent of fixture lumens that reach the work
Electricity is the flow of electrons. Materials that promote the flow of electrons are called
conductors. Metals are typically good conductors. Materials that prohibit the flow of electrons.
o Parallel: Most building ap
Chapter 9: Generation and Distribution
Power: Rate at which work is done. Typically measured in watts (joules per second) or
horsepower (ft-lb per hour). Analogous to speed which is the rate at which distance is covered.
EX: miles per hour
Work: Force app