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This tag refers to alternating current mains power. It usually applies to voltages with >100V RMS, but can also be used for ex. 24V industrial AC power.

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Such a device could be called an attenuator (defined as "an electronic device that reduces the power of a signal without appreciably distorting its waveform.")[1]. For specialized RF situations, ther …
answered Dec 10 '15 by Andrey Akhmetov