# Electric charge

Physical property of matter that causes it to experience a force when placed in an electromagnetic field.

- Electric charge500 related topics

## Ampere hour

An ampere hour or amp hour (symbol: A⋅h or A h; often also unofficially denoted as Ah) is a unit of electric charge, having dimensions of electric current multiplied by time, equal to the charge transferred by a steady current of one ampere flowing for one hour, or 3,600 coulombs.

## Atom

Smallest unit of ordinary matter that forms a chemical element.

The protons have a positive electric charge, the electrons have a negative electric charge, and the neutrons have no electric charge.

## Quark

Type of elementary particle and a fundamental constituent of matter.

Quarks have various intrinsic properties, including electric charge, mass, color charge, and spin.

## Electric field

Physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them.

The electric field is defined mathematically as a vector field that associates to each point in space the (electrostatic or Coulomb) force per unit of charge exerted on an infinitesimal positive test charge at rest at that point.

## Quantum electrodynamics

Relativistic quantum field theory of electrodynamics.

QED mathematically describes all phenomena involving electrically charged particles interacting by means of exchange of photons and represents the quantum counterpart of classical electromagnetism giving a complete account of matter and light interaction.

## Electrostatics

Electrostatics is a branch of physics that studies electric charges at rest (static electricity).

## Physical property

Any property that is measurable, whose value describes a state of a physical system.

electric charge

## Electromagnetic field

An electromagnetic field (also EM field or EMF) is a classical (i.e. non-quantum) field produced by accelerating electric charges.