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2. Uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Uninterruptible_power_supply

   Most UPS below one kilovolt-ampere (1 kVA) are of the line-interactive or standby variety which are usually less expensive. For large power units, dynamic uninterruptible power supplies (DUPS) are sometimes used. A synchronous motor/alternator is connected on the mains via a choke. Energy is stored in a flywheel. When the mains power fails, an ...

3. APC Smart-UPS - Wikipedia

   en.wikipedia.org/wiki/APC_Smart-UPS

   The Smart-UPS is a series of enterprise-level uninterruptible power supplies (UPS) made by American Power Conversion (APC). [1] Most of the units have a SmartSlot (with the exception of SC and SMC series) which accepts an optional interface card providing features ranging from network connectivity to temperature and humidity monitoring. [ 2 ]

4. Surge protector - Wikipedia

   en.wikipedia.org/wiki/Surge_protector

   Surge Protection Device (SPD) for installation in a low-voltage distribution board. A surge protector (or spike suppressor, surge suppressor, surge diverter, [1] surge protection device (SPD), transient voltage suppressor (TVS) or transient voltage surge suppressor (TVSS)) is an appliance or device intended to protect electrical devices in alternating current (AC) circuits from voltage spikes ...

5. Per-unit system - Wikipedia

   en.wikipedia.org/wiki/Per-unit_system

   In the power systems analysis field of electrical engineering, a per-unit system is the expression of system quantities as fractions of a defined base unit quantity. . Calculations are simplified because quantities expressed as per-unit do not change when they are referred from one side of a transformer to t

6. QAnon - Wikipedia

   en.wikipedia.org/wiki/QAnon

   QAnon flag featuring an American flag defaced with the Q logo alongside the slogan "Where we go one, we go all", at a Second Amendment rally in Richmond, 2020. QAnon [a] (/ ˈ k juː ə n ɒ n / CUE-ə-non) is a far-right American political conspiracy theory and political movement that originated in 2017.