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Answer Posted / rajiv agrawal
An uninterruptible power supply (UPS), also known as a
battery back-up, provides emergency power and, depending on
the topology, line regulation as well to connected
equipment by supplying power from a separate source when
utility power is not available. It differs from an
auxiliary or emergency power system or standby generator,
which does not provide instant protection from a momentary
power interruption. A UPS, however, can be used to provide
uninterrupted power to equipment, typically for 5–15
minutes until an auxiliary power supply can be turned on,
utility power restored, or equipment safely shut down.
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