Common Units of Electrical Energy

While studying the basic electrical energy definition and principles are important, you’ll also need to know some formulas and equations as you continue exploring electrical energy. Many of these formulas use the same symbols to signify particular units.

We’ve included a table of some of the most common units of electrical energy for your reference, as well as what each unit means.

Unit of Measurement
Symbol
Definition
Joule
J
The amount of work being done
Electron volt
eV
The energy exerted on one electron through one volt.
Voltage
V
The potential difference between two points
Coulomb
C, or Q, or q when used in the same formula as capacitance.
The quantity of electrical charge
Capacitance
C (Be careful, as this is commonly confusing!)
The capacity of a conductor to store electrical potential energy
Ampere
A
Commonly called an “amp,” the ampere is the unit of measurement that measures the strength of a current when in a conductor.
Second
s
Seconds are a time measurement commonly used to determine the strength of other energy units.
Hour
h
Hours are a time measurement commonly used to determine the strength of other energy units.
Megawatt
MW
1,000,000 watts
Kilowatt
kW
1,000 watts
Watt
W
The rate at which energy is producing work

source https://www.electronics-tutorials.ws/dccircuits/electrical-energy.html

While there are many more units that you may need in your equations for electrical energy, this list should get you started!

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