Enter the circuit voltage (volts) and the equivalent resistance (ohms) into the calculator to determine the Power From Resistance.

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## Power From Resistance Formula

The following formula is used to calculate the Power From Resistance.

P = V^2/ Re

- Where P is the Power From Resistance (watts)
- V is the circuit voltage (volts)
- Re is the equivalent resistance (ohms)

To calculate power from resistance, square the circuit voltage, then divide by the equivalent resistance.

## How to Calculate Power From Resistance?

The following two example problems outline how to calculate the Power From Resistance.

**Example Problem #1:**

- First, determine the circuit voltage (volts). In this example, the circuit voltage (volts) is measured to be 12.
- Next, determine the equivalent resistance (ohms). For this problem, the equivalent resistance (ohms) is calculated to be 5.
- Finally, calculate the Power From Resistance using the formula above:

P = V^2/ Re

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

P = 12^2/ 5 = 28.8 (watts)

**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:

circuit voltage (volts) = 4

equivalent resistance (ohms) = 2

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

P = 16^2/ 2 = 8 (watts)