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`P = I * V`

Enter a value for all fields

The **Electrical Power** calculator computes the power based on Ohm's Law using electrical potential or voltage (V) and current (I).

**INSTRUCTIONS:** Choose units and enter the following:

- (
**V**) Potential (voltage) - (
**I**) Current.

**Electrical Power:** The calculator returns the electrical power in watts. However, this can be automatically converted to other power units via the pull-down menu.

For more information on the relationship between electrical power, current, resistance and potential, see the Ohm's Law Calculator.

**Power:**(watts, milliwatts, kilowatts, horsepower)**Potential:**(volts, millivolts)**V = I • R**: This computes the potential (volts) as a function of current (amps) and resistance (ohms).**V = P / I**: This computes the potential (volts) as a function of power (watts) and current (amps).**V = √(P • R)**: This computes the potential (volts) as a function of power (watts) and resistance (ohms).

**Resistance:**(ohms, milliohms, kiloohms)**R = V²/P**: This computes the resistance (ohms) as a function of potential (volts) and power (watts).**R = P / I²**: This computes the resistance (ohms) as a function of power (watts) and current (amps).**R = V / I**: This computes the resistance (ohms) as a function of potential (volts) and current (amps).

**Current:**(amps, milliamps, microamps, gilberts)**I = V / R**: This computes the current (amps) as a function of potential (volts) and resistance (ohms).**I = P / V**: This computes the current (amps) as a function of the power (watts) and the potential (volts).**I = √(P/R)**: This computes the current (amps) as a function of the power (watts) and the resistance (ohms).

**Power**is a measurement of the energy used to move vehicles (automobiles, trucks, tractors, trains, boats and airplanes).**Power**is the measurement of energy consumed by a motor and transferred to the drive or wheels.**Power**is the amount of electrical energy consumed or produced by a system over time such as the energy produced by a hydroelectric dam or energy consumed by an electrical motor.

**Power **is most commonly measured in watts (W). One watt is equal to one joule per second (1 W = 1 J / 1 s). Power is also measured in horsepower (hp) where 1 horsepower equals 745.7 watts. Power is also measured in heat energy transfer as BTUs per hour (BTU/h).

- Power from Change in Energy over Time
- Power based on Force and Velocity
- P = ΔE / Δt
- ΔE = P * Δt
- Δt = ΔE / P
- Power Dissipated by Friction
- Power from Force, Distance and Time
- Power from Resistance and Current
- Power from Voltage and Resistance
- Power from Current and Voltage
- Power textbook chapter (Light and Matter)