Has electrical charge contained energy

Electrical power

We will deal with electrical energy in this article. We will explain to you what is meant by electrical energy and how to calculate it. This article belongs to the field of physics or electrical engineering.

Electrical energy is energy that is transmitted by means of electricity or stored in electrical fields. The transmission of energy with the help of electricity is also referred to as electrical work. For example, electrical energy can be stored in electrical and magnetic fields and converted into other forms of energy. In physics, the symbol E and the unit watt-second (unit symbol: Ws) are used for electrical energy. 1 Ws = 1 J (joule).


Electric energy formula

The electrical energy "E" is calculated as the product of current "I", voltage "U" and time "t". It is important that the current and voltage are constant over the entire period. In these circumstances the formula is as follows:

The voltage is used in volts, the current in amperes and the time in seconds. The following example illustrates this:


At a voltage of 200V, a current of 4 amps flows over a period of 3 seconds. The electrical energy must be calculated.


Electrical energy: capacitor

The electrical energy "E" in a capacitor can also be calculated. The formula also includes the capacitance "C" of the capacitor and the voltage "U".


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