# Electrical Power Calculator

If you want to evaluate the power utilized by an electrical device, then you can use this electrical power calculator.

The **rate** at which an **electric circuit transfers electrical energy per unit of time** is known as **electrical power**. It is similar to mechanical energy. In mathematical form, **electrical power** is defined as the** product of voltage and current**, where voltage is denoted by V and current is represented by me. The SI unit of power is a watt which is equivalent to 1 J/s.

**Table of Contents**

## Formula of Electrical Power Calculator

To determine the electrical power of a device, you can use our calculator, or you can use the formula listed below:

P = I * V

**Where,**

I = current (A)

V = Voltage (V)

P = Power (W)

For an AC circuit, the equation used to find electrical power is listed below:

P = I * V * PF

**Where,**

PF = Power Factor

**Note:**

To calculate total work, you can use our Work Calculator.

### Example

For a more precise understanding of concepts, let us have an example listed below:

Suppose a cell phone battery works at 12 V and supplies a current of 0.9A to make a call on it. What is the electrical power provided by a phone's battery?

**Given data**

Voltage = 12 V

Current = 0.9 A

**To Find**

Electric power of a battery = ?

**Solution**

To find out the power required from a battery, you can use the formula listed below:

P = I * V

Putting values in the formula:

P = 12 V * 0.9 A

P = 12 J/C * 0.9 C/s = 10.8 J/s

### How to use the Electrical Power Calculator?

The steps to use the electrical power calculator are as follows:

**Step 1: **Enter the value of the current in the first required input.

**Step 2: **Enter the value of voltage in the second required input.

**Step 3: **The calculator will automatically display an answer on the screen.

### Calculator use

Using our free and online electric power calculator, you can find the energy utility or required by an electrical device. Just enter the needed values in the above steps, and our calculator will display the most precise answer on the screen.