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Voltage difference supplied by a voltage (power) generator or a power distribution network, may fluctuate in its value.  The fluctuations can occur due to short circuits, faults and overloads.

A device called a voltage regulator is used to regulate the supply voltage with in an acceptable range for house hold gadgets or other instruments.

If the input voltage (difference) is less than a calibrated value, the gadgets may not function.  If it is more than a limit, then the gadget can get damaged.  Hence, the input voltage is required to be maintained with in a range.

Thus the output of the voltage regulator is called regulated voltage.  The regulated voltage device can supply a maximum rated current with in the range of voltages.

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