A structure or media that absorbs heat.

The electrical and magnetic fields created by the presence or flow of electricity in an electrical conductor or electricity consuming appliance or motor.

The rate of energy transfer equivalent to one ampere under an electrical pressure of one volt. One watt equals 1/746 horsepower, or one joule per second. It is the product of Voltage and Current (amperage).

A product of crude oil that is used for space heating, diesel engines, and electrical generation.

An index that combines sensible temperature and air humidity to arrive at a number that closely responds to the effective temperature; used to relate temperature and humidity to levels of comfort.

Space cooling achieved by shading, natural (unassisted, as opposed to forced) ventilation, conduction control, radiation, and evaporation; also called passive cooling.

For valves and fittings, implies that they are suitable for working pressures between 125 to 175 pounds per square inch.

A fluid used to absorb and transfer heat energy.

The power output of a device under specific or nominal operating conditions.

A discontinuance of electric power supply.

The amount of heat that a material can absorb and store.

The compound (working fluid) used in air conditioners, heat pumps, and refrigerators to transfer heat into or out of an interior space. This fluid boils at a very low temperature enabling it to evaporate and absorb heat.

The thermal energy used in an industrial process.

A device that uses electronic components to regulate the voltage of fluorescent lamps.

Any material that has a limited capacity for conducting an electric current. Certain semiconductors, including silicon, gallium arsenide, copper indium diselenide, and cadmium telluride, are uniquely suited to the photovoltaic conversion process.

A machine for converting mechanical energy into electrical energy by magneto-electric induction; may be used as a motor.

Fuels that cannot be easily made or "renewed," such as oil, natural gas, and coal.

A sinusoidal quantity having a frequency that is an integral multiple of the frequency of a periodic quantity to which it is related.

A measure of the percent of moisture actually in the air compared with what would be in it if it were fully saturated at that temperature. When the air is fully saturated, its relative humidity is 100 percent.

A power source/generator that operates independently of or is not connected to an electric transmission and distribution network; used to meet a load(s) physically close to the generator.