* Uninterruptible power supply (UPS) units comprise rechargeable batteries that retail outlet just enough electricity to allow the consumer adequate time, from the party of the blackout or brownout, to adequately save information in memory and securely turn off the device. all classes and interfaces within the superclass hierarchy (e.g. https://louisedauq.educationalimpactblog.com/55518095/5-simple-statements-about-uninterruptible-power-supply-calculator-explained