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Electrical Energy Calculator

Last updated: Monday, May 01, 2023
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Power & Time

The electrical energy can be determined using the relationship between electric power and time. The formula for electric power is:

Power = Energy / time

Rearranging this formula, we get:

Energy = Power x time

So, to determine the electrical energy used over a given time period, we simply need to multiply the electric power by the time for which it is used.

For example, if a device has an electric power of 100 watts and is used for 2 hours, the electrical energy used can be calculated as:

Energy = Power x time

= 100 watts x 2 hours

= 200 watt-hours (Wh)

This means that the device used 200 watt-hours of electrical energy over the 2-hour period.

An alternative formula for determining the electric energy can be derived from:
\(E\) \(=\) \(P\) \(\cdot\) \(t\)
\(E\): the electric energy
\(P\): the electric power
\(t\): the duration
The SI unit of electric energy is: \(joule\text{ }(J)\)

Find E

Use this calculator to determine the electric energy when the electric power and time are given
the electric power
the duration
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