Rockwell Automation 1426 PowerMonitor 5000 Unit - Manual (Page 387)

Rockwell Automation Publication 1426-UM001F-EN-P - November 2013 387
Glossary
Watt Hour (Whr) The number of watts used in one hour. Because the power usage varies, it is
necessary to integrate this parameter over time. Power flow can be either forward
or reverse.
Wattmeter An instrument for measuring the real power in an electric circuit. Its scale is
usually graduated in watts, kilowatts, or megawatts.
Volt Ampere Reactive Hours
(VARH)
The number of VARs used in one hour. Because the value of this parameter
varies, it is necessary to integrate it over time. VARs can be either forward or
reverse.