If you are referring to domestic electrical outlets, most regions use either 110 - 120 volts or 230 - 240 volts.
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Neither. A.C. voltage, and current, are expressed as root-mean-square (rms) values, and this is what a voltmeter and an ammeter reading will indicate. To measure peak voltage, or peak-to-peak voltage, you will need to use an oscilloscope.
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how which is right and which is wrong. You need a voltage standard with that you can calibrate both to the standard
What it means is that those rated values may not be exceeded, they are the maximum that the machine can take.
The ratio of RB1 to RBBO is the intrinsic standoff ratio. It is the standoff voltage ratio to the power supply voltage.