What Does an AC Voltmeter Measure?
نویسندگان
چکیده
An AC voltmeter is a device that measures the (peak) oscillating current I0 across a large resistor R0 that is attached to leads whose tips, 1 and 2, may be connected to some other circuit. The reading of the voltmeter (if properly calibrated) is Vmeter = I0(R0 + Rleads) where Rleads R0. AC voltmeters typically report the root-mean-square voltage Vrms = I0(R0 +Rleads)/ √ 2 rather than I0(R0 +Rleads).
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