AhaBulbStuff Everyone Should Know
AhaBulb: Stuff Everyone Should Know · ahabulb.com/eng-rms-120v-peak

A US wall outlet is called 120 V AC. About what peak voltage does it actually swing to?

Start playing free

  1. 120 V
  2. About 170 V
  3. About 240 V

🔒 The answer is for AhaBulb members. Members see the answer, why it's right and the official sources for every card of Stuff Every Engineer Should Know, plus timed practice exams.

The first 50 cards of every test are free to play.

Play the free cards See membership

Like this card?
Play the game

References

  1. OpenStax College Physics 2e, 20.5 Alternating Current versus Direct Current openstax.org/books/college-physics-2e/pages/20-5-alternating-current-versus-direct-current Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

EngineeringHow many base units does the International System of Units (SI) have?EngineeringSince the SI redefinition voted in 2018, what defines the kilogram?EngineeringIn today's SI, how precisely is the value of the Planck constant known?

That's stuff everyone should know.