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The elementary charge (symbol e or sometimes q) is the electric charge carried by a single proton, or equivalently, the negative of the electric charge carried by a single electron.

This is a fundamental physical constant and the Units of measurement of electric charge in the system of atomic units as well as some other systems of natural units.

It has a value of 1.602 176 487 × 10-19 coulomb, according to the 2006 Committee on Data for Science and Technology list of physical constants. In the centimetre gram second system of units, the value is 4.803 204 273 × 10-10 statcoulombs.

Since it was first measured in Robert Andrews Millikan's famous oil-drop experiment in 1909, the elementary charge has been considered indivisible. Quarks, first posited in the 1960s, are believed to have fractional electric charges (in units of e/3 and 2e/3), but only to exist in particles with an integer charge. They have never been detected singly, and for this reason as well as historical ones, they are not considered the elementary charges. In 1982 Robert B. Laughlin tried to explain the fractional quantum Hall effect by predicting the existence of fractionally charged quasiparticles. In 1995, the fractional charge of Laughlin quasiparticles was measured directly in a quantum antidot electrometer at State University of New York at Stony Brook, New York. In 1997, two groups of physicists at the Weizmann Institute of Science in Rehovot, Israel, and at the Commissariat à l'énergie atomique laboratory near Paris, claimed to have detected such quasiparticles carrying an electric current.

External links

• "Measurement of fractional charge" (Science Report) 1995
• "Quantum antidot electrometer"
• "Fractional charge carriers discovered" - Physics Web article 1997-10-24
• "Direct observation of a fractional charge" (letter to Nature) 1997

References Fundamentals of Physics, 7th Ed., Halliday, Robert Resnick, and Jearl Walker. Wiley, 2005

The elementary charge (symbol e or sometimes q) is the electric charge carried by a single proton, or equivalently, the negative of the electric charge carried by a single electron.

This is a fundamental physical constant and the Units of measurement of electric charge in the system of atomic units as well as some other systems of natural units.

It has a value of 1.602 176 487 × 10-19 coulomb, according to the 2006 Committee on Data for Science and Technology list of physical constants. In the centimetre gram second system of units, the value is 4.803 204 273 × 10-10 statcoulombs.

Since it was first measured in Robert Andrews Millikan's famous oil-drop experiment in 1909, the elementary charge has been considered indivisible. Quarks, first posited in the 1960s, are believed to have fractional electric charges (in units of e/3 and 2e/3), but only to exist in particles with an integer charge. They have never been detected singly, and for this reason as well as historical ones, they are not considered the elementary charges. In 1982 Robert B. Laughlin tried to explain the fractional quantum Hall effect by predicting the existence of fractionally charged quasiparticles. In 1995, the fractional charge of Laughlin quasiparticles was measured directly in a quantum antidot electrometer at State University of New York at Stony Brook, New York. In 1997, two groups of physicists at the Weizmann Institute of Science in Rehovot, Israel, and at the Commissariat à l'énergie atomique laboratory near Paris, claimed to have detected such quasiparticles carrying an electric current.

External links

• "Measurement of fractional charge" (Science Report) 1995
• "Quantum antidot electrometer"
• "Fractional charge carriers discovered" - Physics Web article 1997-10-24
• "Direct observation of a fractional charge" (letter to Nature) 1997

References Fundamentals of Physics, 7th Ed., Halliday, Robert Resnick, and Jearl Walker. Wiley, 2005

Elementary charge - Wikipedia, the free encyclopedia
The elementary charge, usually denoted "e ", [1] is the electric charge carried by a single proton, or equivalently, the negative of the electric charge carried by a single ...

TCAEP.co.uk :: Science-Constants-Elementary Charge
Name: Elementary Charge : Symbol: e : Value: 1.602 176 462 ± 0.000 000 063 × 10 −19 C : Category: General Physical Constants : Comments: The elementary charge is equal to the ...

Elementary charge - encyclopedia article - Citizendium
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CODATA Value: elementary charge
elementary charge : Value: 1.602 176 487 x 10-19 C : Standard uncertainty: 0.000 000 040 x 10-19 C : Relative standard uncertainty: 2.5 x 10-8: Concise form 1.602 176 487(40) x 10 ...

The Elementary Charge
The Elementary Charge     In 1896 Joseph John Thomson discovered the electron. However he didn't manage to define its mass or its charge. He only calculated the proportion of the ...

The Elementary Charge
The Elementary Charge . In 1896 Joseph John Thomson discovered the electron. However he didn't manage to define its mass neither its charge. He only calculated the proportion of ...

IUPAC Gold Book - elementary charge
PAC, 1996, 68, 957 (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 972

The Elementary Charge of an Electron
Summer Research Program for Secondary School Teachers . Thomas Byrne. New Rochelle High School, Westchester. 2002     The Elementary Charge of an Electron

Elementary charge
Elementary charge . scroll Smallest electric charge unit (1.6021·10-19 Coulomb). The electric charge occurs only in integral multiples of this unit.

Elementary Charge - DiracDelta Science & Engineering Encyclopedia
Science Engineering Encyclopedia ... Elementary Charge The electric charge on an electron particle. e = 1.602176462x10-19 C