An administrator has a UPS rated at 200 amps per hour. Which of the following is the maximum runtime of this UPS when hooked up to a server drawing 400 amps per hour?

15 minutes would result from a load drawing 800 amps per hour against a 200 amp-hour UPS, not the 400 amps stated.

Runtime is calculated by dividing the UPS rated capacity (200 amp-hours) by the power draw of the connected load (400 amps per hour), which equals 0.5 hours or 30 minutes. This ampere-hour division is the standard method for estimating how long a UPS can sustain a given load before its battery is exhausted.

60 minutes would require the load to draw exactly 200 amps per hour, matching the UPS capacity in a one-to-one ratio.

120 minutes would only be achievable if the load drew 100 amps per hour, which is one-quarter of the stated 400 amp draw.