VAC is an abreviation for Volts Alternating Current. A Volt is the potential difference across a conductor when a current of one ampere dissipates one watt of power. Alternating Current means that the number of Volts changes in the form of a sign wave, smoothly alternating between two directions of flow. Voltage is analogous to water pressure in a pipe (whereas current is analogous to the volume of water flowing past a point along the pipe).

Mentioned in:
Video Box Generator - 610 Series & 620B
Video Sync Separator, Sync Stripper, Sync Generator 315 Series
Video Caliper, Video Based Measurement, Video Scaler, Video Inspection Instrument Model 308
Horizontal Video Caliper, Video Based Image Measurement, Video Micrometer, Video Scaler Model 307
Video Cross Hair & Video Cross Line Generator & XY Positioner - 620 Series