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Electricity In Your Home
How much do you know about the electrical power in your home?
#1 Most of the power consumed in American homes comes from which of the following sources?
#2 What is the most common phasing and voltage combination found in homes in the United States?
Single phase 120/240
Three phase 277/480
Three phase 120/240
Three phase 120/208
Single phase 120/208
#3 The power grid serving most of the United States operates at how many cycles per second (Hz)?
#4 The white wire is always a grounded conductor.
#5 What are circuit breakers NOT designed to do?
Protect people from electrocution
Protect buildings and equipment
Prevent wires from carrying more current than they can handle
Interrupt up to 10,000 amps without being destroyed
#6 What is generally considered to be the minimum number of Amps required to be lethal to humans?
More than 30 A
More than 20 A
About 15 A
About 1 A
Less than 0.1 A
#7 What does GFCI stand for?
Grandfathered, crusty, insulation
German/French Cable Institute
Ground fault circuit interrupter
Grimy frayed cable indicator
None of the above
#8 GFCI devices are effective at reducing the hazards of using electricity near water.
#9 An electrical transformer is NOT:
Normally found in homes
A device used to change voltages
Used for DC power
Used by electrical utility companies
#10 The third prong (ground prong) of a plug is always for safety, and never required for the operation of electrical devices.
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