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The volt-ampere (SI symbol: VA, [1] sometimes V⋅A or V A) is the unit of measurement for apparent power in an electrical circuit. It is the product of the root mean square voltage (in volts ) and the root mean square current (in amperes ). [ 2 ]
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.
Apparent power is the product of the RMS values of voltage and current in an alternating current circuit. It is the magnitude of the complex power, which also includes active and reactive power. Learn how to calculate and understand these concepts with diagrams and equations.
A watt is the SI unit of power or radiant flux, equal to 1 joule per second or 1 kg⋅m 2 ⋅s −3. It is named after James Watt, an 18th-century inventor who improved the steam engine. Learn how to calculate watt, see examples, and explore its multiples and submultiples.
Learn about the mathematics, diagrams, and properties of three-phase electric power systems, which have at least three conductors carrying alternating voltages that are offset in time by one-third of the period. Find out how to calculate power, current, and voltage in balanced and unbalanced systems, and how to convert to other phase systems.
Learn about the history, safety features, and ratings of different types of plugs and sockets for mains electricity. Find out how to use adaptors, multi-standard sockets, and extension cords for various devices and regions.
A simple voltage dropper can be used to reduce the voltage for low-power devices; if more than 12V is required, or for high-powered devices, a switched-mode power supply is used. The output will usually be DC in the range 1.5–24 V. Power supplies that output either 100–120 V AC or 210–240 V AC are available; they are called inverters ...
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.