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`Delta E = "P" * Delta t `

Enter a value for all fields

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

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

- (
**P**) This is the constant power expended during the time. - (
**Δt**) This is the change in time.

**Energy (ΔE):** The calculator returns the change in energy in kiloWatt-hours. However, this can be converted to compatible units (e.g. Joules) via the pull-down menu.

The formula for the change in energy due to power is:

where:

**P**is the constant power expended during the time.**Δt**is the 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)

- Enter the lightbulb's wattage (e.g. 200 watts) in the power field.
- Choose time units (e.g. hours)
- Enter the time duration (e.g. 24 hours)
- Energy in Joules is returned (e.g. 17,280,000 Joules)
- Click on the J unit button and select kWh
- 4.8 kWh is returned.