MOV

1. Short for Metal Oxide Varistor, MOV is a is a device found in surge protectors that contains a piece of metal oxide that conducts current anytime the current is over the clamping voltage and passes that current to the ground. Over time this device can degrade or even fail if too much current is conducted. Often when this occurs surge protectors with a status indictor will turn off.
   
   The status indicator should not to be confused with the power switch light, which is often only use to indicate the surge protector is getting power.
   
    
2. A file extension of a Apple QuickTime video file.

Also see: Clamping voltage, Surge protector