A type of heating system that generates heat by passing current through a conductor, causing it to heat up. These systems usually use baseboard heaters, often with individual controls. They are inefficient and are best used as a backup to more efficient options, such as solar heating or a heat pump.

Source for all power to the home. All circuits originate from the "Load Center" or "Service Panel." Circuit breakers are located within this panel.

Electric current, which changes direction with a regular frequency. Domestic mains in the UK have a frequency of 50 Hertz.

The surrounding temperature of an area.

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

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.

An indication of how well a furnace converts energy into usable heat. The rating is expressed as a percentage of the annual output of heat to the annual energy input to the furnace.

Utilization equipment, generally other than industrial, normally built in standardized sizes or types, that is installed or connected as a unit to perform one or more functions such as clothes washing, air conditioning, food mixing, deep frying, etc.

A group of two or more cells connected together to provide electrical current. Sometimes also used to describe a single cell that converts chemical energy to electrical current.

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