An ideal regulated power supply is one which has voltage regulation of _______.

• Voltage regulation is the ratio of the difference in voltage drop from no load and the full load to the no-load voltage.
• Mathematically, there are two ways to express the voltage regulation:

           \(VR = \frac{{{V_{NL}} - {V_{FL}}}}{{{V_{NL}}}}\)

           VNL = No-load voltage and

           VFL = Full load voltage

• The above formula is normally used in the case of transformers.
• For alternators and power system calculations, the formula used is:

          \(VR = \frac{{{V_{NL}} - {V_{FL}}}}{{{V_{FL}}}}\)

Observation:

Ideally for a regulated power supply V_NL = V_FL

So, the Voltage regulation is:

\(VR = \frac{{{V_{NL}} - {V_{FL}}}}{{{V_{NL}}}}=0\)%

It should be as low as possible for the proper operation of the electrical devices.