What is the difference between watts and volt-amperes?
You’ll notice that specs for uninterruptible power systems seldom if ever mention watts (W), but instead speak in terms of volt-amperes (VA). Watts refer to “real power,” while volt-amperes refer to “apparent power.” Both are simply the product of voltage (V) multiplied by amperage (A). Thus, a device drawing 3 amps at 120 volts would be rated at 360 watts or 360 volt-amperes.… Read more