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Constant Voltage Transform Power

Many people don't realize that a  transformer labeled for use with a specific voltage will work just as well at other voltages. This calculator provides power delivered from a transformer tap when driven with other than the rated voltage.

Example: You are installing a distributed system with very long lines. To overcome line loss, you select a 140 volt system. Which transformer tap will feed 10 watts to a loudspeaker with a "70V transformer?

1. Enter values for both "Voltage Rating of Transformer" and "New Voltage" 

2. Either:

  •  Enter a value for "Tap Rating" to calculate the power output from the tap at the new voltage.
  •  Enter a value for "Power from Tap" to calculate the correct transformer tap to achieve the desired power at the new voltage.

This form requires a Microsoft Internet Explorer 4.0+ browser.

Voltage Rating of Transformer

Tap Rating

New Voltage

Power from Tap


volts

watts

volts

watts

Note: Fields should be reset before each new calculation.





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