I keep getting “RMS value” questions wrong in Alternating Current. What's the trap?
taking the 220 V mains as the peak voltage.
The usual trap: taking the 220 V mains as the peak voltage. How to avoid it: 220 V mains is the rms value; the peak is about 311 V. Go back to the definition — the effective (root-mean-square) value of AC that delivers the same heating as a steady DC; Vrms = V0/√2.
Key point
RMS value
Common mistake
taking the 220 V mains as the peak voltage.
Memory tip
220 V mains is the rms value; the peak is about 311 V.
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