What is the unit of electric current?
AnswerAmpere
Current is measured in amperes, or amps.
Science · Facts & stats
Electric facts & stats
7 fact-checked facts about electricity, circuits and electrical science, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is the unit of electrical resistance?
AnswerOhm
Resistance is measured in ohms, named after Georg Ohm.
Going deeper
What is the nominal voltage of a standard household outlet in the United States?
Answer120 volts
US homes use about 120 V for standard outlets.
Who built the first electric battery, the voltaic pile, around 1800?
AnswerAlessandro Volta
Volta's stack of zinc and copper discs was the first true battery.
In the 'war of the currents', which type of current did Thomas Edison champion?
AnswerDirect current (DC)
Edison backed DC, while Westinghouse and Tesla promoted AC.
Expert level
Who discovered electromagnetic induction in 1831?
AnswerMichael Faraday
Faraday showed a changing magnetic field induces a current, the basis of generators.
What unit measures electrical capacitance?
AnswerFarad
Capacitance is measured in farads, named for Michael Faraday.
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