What is an UPS?
UnInterruptible Power Supply (UPS) is an electrical equipment that provides emergency power to a load when the main input power source fails. A UPS differs from an auxiliary or emergency power system or standby generator because it will provide near-instantaneous protection from input power interruptions, by supplying energy stored in batteries.
A UPS has internal batteries to guarantee that continuous power is provided to the equipment even if the power source stops providing power. Even though the UPS can provide a short on battery run time power for a while,, however this time is enough to execute an safely shutdown of the connected apparatus ( computers, telecommunication and other electronic equipments. etc) .or to switch on a standby power source.