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Volt-ampere (VA) is the unit of apparent power in an electrical circuit, equal to the product of root mean square voltage and current. Learn how VA differs from real power (watts) and reactive power (var), and how it is used for generators, transformers and UPSs.
An electronvolt (eV) is the amount of energy gained or lost by a single electron when it moves through an electric potential difference of one volt in vacuum. It is widely used in physics, especially in particle physics, and has a fixed value of 1.602 176 634 × 10−19 J.
A list of symbols, names and formulas for various quantities and units in electromagnetism, based on the International System of Units (SI). Find out the definitions and conversions of electric charge, current, potential, resistance, capacitance, flux, field, induction and more.
Ampere-hour (A⋅h or A h) is a unit of electric charge, equal to the charge transferred by a steady current of one ampere flowing for one hour. Learn how to convert ampere-hour to other units, such as coulombs, and how it is used in electrochemical systems and batteries.
The henry (H) is the SI unit of electrical inductance, named after Joseph Henry. It measures the voltage induced by a changing current in a coil or circuit. Learn how to calculate and use the henry in different scenarios.
The ampere (symbol: A) is the unit of electric current in the International System of Units (SI), named after André-Marie Ampère. It is defined by fixing the elementary charge e to be exactly 1.602 176 634 × 10−19 C, and one ampere is equal to one coulomb per second.
Learn about the process and devices of converting electric energy between different forms, such as AC and DC, or different voltages and frequencies. Find examples of power converters, transformers, and applications in power systems and electronics.
A list of examples of power in watts produced by various sources of energy, grouped by orders of magnitude from small to large. The term terawatts is not used in the list, but it is equivalent to 10^12 watts, which is the power consumption of the world in 2019.