Voltage Regulation Calculator
Calculate voltage regulation percentage from no-load and full-load voltages for power supply and transformer analysis.
Voltage Regulation in Power Systems
Voltage regulation measures how much the output voltage of a power source drops when load is applied. Transformers, generators, and regulated power supplies are rated partly by their regulation percentage. Lower regulation means more stable output under varying loads.
Formula
$$VR\% = \frac{V_{nl} - V_{fl}}{V_{fl}} \times 100$$\(V_{nl}\) is the no-load voltage (open circuit) and \(V_{fl}\) is the full-load voltage at rated current. A positive result means voltage drops under load, which is typical for most sources.
Typical Values
Well-designed power supplies often achieve regulation below 1%. Small transformers may show 3% to 10% depending on size and design. Compare regulation only at the same load conditions and power factor.
Related tools: HP to Amps Calculator and Bridge Rectifier Calculator.
Frequently Asked Questions
What is no-load voltage?
No-load voltage is measured at the output terminals when no current is drawn. It is typically higher than the voltage under full rated load.
Can voltage regulation be negative?
Yes, if full-load voltage exceeds no-load voltage. Some regulated supplies with feedback can show negative regulation, though positive values are more common.
Why divide by full-load voltage?
Using Vfl as the reference normalizes regulation relative to the operating voltage, making it easier to compare sources at different voltage levels.
How is this different from voltage drop?
Voltage drop is the absolute difference (Vnl minus Vfl) in volts. Voltage regulation expresses that drop as a percentage of the full-load voltage.
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