Enter the total power (watts) and the total resistance (ohms) into the calculator to determine the Voltage from Power.

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## Voltage from Power Formula

The following formula is used to calculate the Voltage from Power.

**V = SQRT ( P*R)**

Variables:

- Where V is the Voltage from Power (volts)
- P is the total power (watts)
- R is the total resistance (ohms)

## How to Calculate Voltage from Power?

The following two example problems outline how to calculate the Voltage from Power.

**Example Problem #1:**

- First, determine the total power (watts). In this example, the total power (watts) is measured to be 78.
- Next, determine the total resistance (ohms). For this problem, the total resistance (ohms) is calculated to be 9.
- Finally, calculate the Voltage from Power using the formula above:

V = SQRT ( P*R)

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

V = SQRT ( 78*9) = 26.49 (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:

total power (watts) = 90

total resistance (ohms) = 85

Entering these values into the formula or calculator above gives us::

V = SQRT ( 90*85) = 87.46 (volts)