what is the definition of VAC?

greenfees · #1 Aug 6, 2008, 04:47 AM

when you speak of 220VAC, what is the definition of VAC?

donf · Aug 6, 2008, 06:28 AM

Actually, you now speak of 120 VAC and 240 VAC.

The term "AC" stands for "Voltage Alternating Current"

KeepItSimpleStupid · Aug 6, 2008, 06:38 AM

Homework? Since 220 was used, maybe not.

V is for Volts. AC means Alternating Current
220 V doesn't usually exist in the US anymore,it's 120/240.

It's not complete: 240 Vrms AC +-5%, 60 Hz
Frequency tolerences for the mains are quite good, but for appliance inputs you may see 50/60 Hz.

You also might see 90-285 VAC 50/60 Hz.

RMS stands for Root-Mean-Square. I'm not going to get into the Calculus, but AC meters can be True RMS meters or Average responding RMS reading and they are correct only for sine wave inputs.

A 120 V RMS signal has the same heating value as a 120 V DC signal when applied to the same resistive load.



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