🔍 Key Concepts

• RMS voltage vs peak voltage in AC circuits • Typical household mains voltage rating in North America • Relationship between RMS and peak: Vrms = Vpeak / √2

💭 Think About

• Think about what voltage value is normally printed on household appliances and power strips in the U.S.—is it closer to 80 V, 120 V, 160 V, or 330 V? • If a sine-wave AC source has a certain peak voltage, would the RMS value be higher or lower than the peak? Which option looks like a realistic RMS value? • Compare each choice to the common nominal outlet voltage you’re familiar with and ask: which one is in the right ballpark for everyday household use?

✅ Before You Answer

• Verify the typical nominal voltage of common household outlets used in North America (often stated on equipment labels). • Check that an RMS value must be less than its peak value for a sine wave, using Vrms = Vpeak / √2. • Eliminate any values that are clearly too low or too high to run standard household appliances.