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The volt (symbol: V) is the unit of electric potential, electric potential difference , and electromotive force in the International System of Units (SI). [1]
The SI unit of work per unit charge is the joule per coulomb, where 1 volt = 1 joule (of work) per 1 coulomb of charge. [citation needed] The old SI definition for volt used power and current; starting in 1990, the quantum Hall and Josephson effect were used, [10] and in 2019 physical constants were given defined values for the definition of all SI units.
SI multiples of volt (V) Submultiples Multiples Value SI symbol Name Value SI symbol Name 10 −1 V dV decivolt 10 1 V daV decavolt 10 −2 V cV centivolt 10 2 V hV hectovolt 10 −3 V mV millivolt 10 3 V kV kilovolt 10 −6 V μV microvolt 10 6 V MV megavolt 10 −9 V nV nanovolt 10 9 V GV gigavolt 10 −12 V pV picovolt 10 12 V TV teravolt
Symbol [1] Name of quantity Unit name Symbol Base units E energy: joule: J = C⋅V = W⋅s kg⋅m 2 ⋅s −2: Q electric charge: coulomb: C A⋅s I electric current: ampere
In short, an electric potential is the electric potential energy per unit charge. This value can be calculated in either a static (time-invariant) or a dynamic (time-varying) electric field at a specific time with the unit joules per coulomb (J⋅C −1) or volt (V). The electric potential at infinity is assumed to be zero.
The International System of Electrical and Magnetic Units is an obsolete system of units used for measuring electrical and magnetic quantities. It was proposed as a system of practical international units (e.g., the international ampere, the international ohm, the international volt) by unanimous recommendation at the International Electrical Congress (Chicago, 1893), discussed at other ...
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The electric field is defined as a vector field that associates to each point in space the force per unit of charge exerted on an infinitesimal test charge at rest at that point. [2] [3] [4] The SI unit for the electric field is the volt per meter (V/m), which is equal to the newton per coulomb (N/C). [5]