Enter the rated power (watts) and the nominal resistance (ohms) into the calculator to determine the Rated Volts.

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## Rated Volts Formula

The following formula is used to calculate the Rated Volts.

Vr = SQRT( Pr * Rn)

- Where Vr is the Rated Volts (volts)
- Pr is the rated power (watts)
- Rn is the nominal resistance (ohms)

To calculate the rated voltage, take the square root of the product of the rated power times the nominal resistance.

## How to Calculate Rated Volts?

The following two example problems outline how to calculate the Rated Volts.

**Example Problem #1:**

- First, determine the rated power (watts). In this example, the rated power (watts) is measured to be 150.
- Next, determine the nominal resistance (ohms). For this problem, the nominal resistance (ohms) is calculated to be 50.
- Finally, calculate the Rated Volts using the formula above:

Vr = SQRT( Pr * Rn)

Inserting the values from above and solving the equation with the imputed values gives:

Vr = SQRT( 150 * 50) = 86.602 (volts)

**Example Problem #2: **

Using the same process as example problem 1, we first define the variables outlined by the formula. In this case, the values are:

rated power (watts) = 60

nominal resistance (ohms) = 70

Entering these values into the formula above gives :

Vr = SQRT( 60 * 70) = 64.807 (volts)