A unit or measure of solar radiation; 1 calorie per square meter or 3.69 Btu per square foot.

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

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

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

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.

The addition of dopants to a semiconductor.

A device that transfers heat by the continuous evaporation and condensation of an internal fluid.

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

Classifications of fires developed by the National Fire Protection Association.

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).

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

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

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

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

A fluid used to absorb and transfer heat energy.

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

A structure or media that absorbs heat.

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

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

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.