What is the standard household voltage in the United States?
AnswerAbout 120 volts
US outlets supply roughly 120 volts.
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Challenge Outlet facts & stats
7 fact-checked facts about electrical outlets, plugs and home power basics, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Why should you avoid overloading a power strip?
AnswerIt can overheat and cause a fire
Too much load can overheat wires and connectors.
Going deeper
What is the standard mains frequency in the US?
Answer60 Hz
North America uses 60 hertz alternating current.
Where are GFCI outlets typically required in homes?
AnswerNear water, like kitchens and bathrooms
Codes require GFCI protection in wet or damp areas.
What does 'AC' stand for in AC power?
AnswerAlternating current
AC periodically reverses direction.
Expert level
What does an AFCI device protect against?
AnswerArc faults that can start fires
Arc-fault circuit interrupters detect dangerous arcing.
Who was the main champion of AC power in the 'War of the Currents'?
AnswerNikola Tesla with George Westinghouse
Tesla and Westinghouse backed AC against Edison's DC.
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