Common electrical terminology

ampacity

The current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

ampere

A type of electric current produced by one volt applied across a resistance of one ohm. It is also equal to the flow of one coulomb per second. Named after French physicist Andre M. Ampère 1836.

branch circuit

The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).

brownout

A reduction in voltage and/or power when demand for electricity exceeds generating capacity. The term brownout is misleading because customers generally do not notice the reduction, except when it affects sensitive electronic equipment.

circuit breaker

A device designed to open and close a circuit by non-automatic means and to open the circuit automatically on a pre-determined overcurrent without damage to itself when properly applied within its rating.

circuit extensions

To extend or add-on to an existing circuit to provide an additional power source.

code corrections

Procedure designed to eliminate wiring conditions that do not meet National Electrical Code requirements and safety conditions.

continuous load

A load where the maximum current is expected to continue for 3 hours or more.

fault

A short circuit in an electrical system.

ground wire

A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and the earth, or to some conducting body that serves in place of the earth. Being grounded means connected to earth or to some conducting body that serves in place of the earth.

impedance

The total effects of a circuit that oppose the flow of an AC current consisting of inductance, capacitance, and resistance. It can be quantified in the units of ohms.

impulse

A current surge.