Electric charge is a fundamental conserved property of some subatomic particles, which
determines their electromagnetic interaction. Electrically charged matter is influenced by,
and produces, electromagnetic fields. The interaction between a moving charge and an electromagnetic
field is the source of the electromagnetic force, which is one of the four fundamental forces.
Electric charge is a characteristic of some subatomic particles. It is quantized in that,
when expressed in units of the so-called elementary charge e, it takes integer or fractional
values. Electrons by convention have a charge of −1, while protons have the opposite charge
of +1. Quarks have a fractional charge of −1⁄3 or +2⁄3. The antiparticle equivalents of these
(positrons, antiprotons, and antiquarks, respectively) have the opposite charge. There are
other charged particles.
The discrete nature of electric charge was proposed by Michael Faraday in his electrolysis
experiments, and then directly demonstrated by Robert Millikan in his oil-drop experiment.
In general, same-sign charged particles repel one another, while different-sign charged particles
attract. This is expressed quantitatively in Coulomb's law, which states that the magnitude
of the electrostatic repelling force between two particles is proportional to the product
of their charges and the inverse square of the distance between them. - Wikipedia
The table below gives conversion factors to move back and forth between units of electric
Standard unit = Coulomb (C)
||2.778 * 10-3
||2.998 * 1010
||1.079 * 1013
||2.778 * 10-4
||2.998 * 109
|3.336 * 10-11
||9.266 * 10-14
||3.336 * 10-10
Note: The prefix "ab" is used to indicate an electromagnetic unit
in the centimeter-gram-second system.
The prefix "stat" is used to indicate an electrical unit in the electrostatic centimeter-gram-second
system of units.