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.

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.

The amount that the voltage, current, and/or power output of a solar cell changes due to a change in the cell temperature.

A structure or media from which heat can be absorbed or extracted.

The addition of dopants to a semiconductor.

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

The amount (percent) of light that is reflected by a surface relative to the amount that strikes it.

The amount of heat in a quantity of matter at a specific temperature and pressure.

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

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

Classifications of fires developed by the National Fire Protection Association.

The process of changing from one physical state (solid, liquid, or gas) to another, with a necessary or coincidental input or release of energy.

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

An aluminum foil fabricated insulator with backings applied to provide a series of closed air spaces with highly reflective surfaces.

The total amount of electric energy loss in an electric system between the generation source and points of delivery.

The cost of producing one additional unit of a product.

A type of solar thermal collector in which a heat transfer fluid drips out of header pipe at the top of the collector, runs down the collector absorber and into a tray at the bottom where it drains to a storage tank.

A fluid used to absorb and transfer heat energy.

A unit of electricity consumption of one Watt over the period of one hour.