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.
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. -
The table below gives conversion factors to move back and forth between units of electric
Standard unit = Coulomb (C)
Note: The prefix "ab" is used to indicate an electromagnetic unit in the
|1 abC =
||2.778 * 10-3
||2.998 * 1010
|1 A·h =
||1.079 * 1013
|1 C =
||2.778 * 10-4
||2.998 * 109
|1 statC =
||3.336 * 10-11
||9.266 * 10-14
||3.336 * 10-10
The prefix "stat" is used to indicate an electrical unit in the
electrostatic centimeter-gram-second system of units.