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`P = ( Delta E )/( Delta t )`

Enter a value for all fields

The **Power** calculator computes the power based on the change in Energy (ΔE) and the time duration (Δt).

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

- (
**ΔE**) Change in energy. - (
**Δt**) Change in time.

**Power (P):** The calculator returns the power in watts (W). However, this can be converted to compatible units via the pull-down menu.

The Math / Science

The formula for Power is:

P = ΔE / ΔT

where:

- P = power
- ΔE = change in energy
- ΔT = change in time

**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)