**Electric Charge:**

A fundamental intrinsic property of matter that gives rise to the attractions and repulsions between electrons and protons.

**Coulomb:**

The typical unit for measuring charge; a set number of electrons.

1 Coulomb = 6.25x10^{18} electrons

**Charging by Contact:**

The transfer of electric charge from one object to another by simple contact or conduction.

**Charging by Induction:**

Redistribution or charging of an object by bringing a charged item in close proximity to, but not touching, an uncharged object.

**Coulomb’s Law:**

Mathematical relationship between electric force, charge, and distance. The electric force varies directly with the product of the charges, and inversedly to the square of the distance between the charges.

**Polarization:**

Separation or alignment of the charges in a neutral body so that like charges are grouped together, resulting in a positive and a negative region.

**Electric Field:**

A force field that fills the space near any charge.

**Electric Potential:**

The ratio of electric potential energy to electric charge at a particular spot in an electric field. It is often referred to as voltage since it is measured in volts.

**Equipotential Line: **

A line where all points have an equal electric potential, or voltage.