Not necessarily. A UPS is primarily designed to produce a short period of power in the case of the mains failing.
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voltage
In the electrical trade it is called control voltage. This voltage can be any voltage. In North America the common control voltage is 120 volts.
Whenever you are working over a device and getting a constant voltage supply ,, and all of a sudden .. the light gets off and the device is off. it means a device was working over some specified voltage and it comes to 0 instantly . the voltage changes . this is called voltage fluctuation .
With voltage control there is so much voltage drop due to resistor, that's the disadvantage
A control transformer marked 240V - 24Vac would have a control voltage of 24 volts.