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.
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 70-volt transformer?
1. Enter values for both “Voltage Rating of Transformer” and “New Voltage”
- 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.
Equation used to calculate the data:
Pactual = (Vnew squared / Vrated squared) * Prated
Prated = transformer tap value
Pactual = new power from tap
Vrated = voltage rating of transformer
Vnew = new voltage