An air heater in which air is blown over electric resistance heating coils.

A unit of rate of water evaporation equal to the evaporation per hour of 34.5 pounds of water at a temperature of 212 degrees Fahrenheit into steam at 212 degrees F.

A federal agency established in 1933 to develop the Tennessee river valley region of the southeastern U.S., and which is now nation's largest power producer.

The amount of visible light that passes through the glazing material of a window, expressed as a percentage.

A thin sheet of material (metal) of a heat exchanger that conducts heat to a fluid.

The process in which a solid fuel is converted into a gas; also known as pyrolitic distillation or pyrolysis. Production of a clean fuel gas makes a wide variety of power options available.

The unit price and quantity to which it applies as specified in a rate schedule or contract.

The wind speed with 50 percent probability of occurring.

The maximum load that a device is capable of carrying.

An incorporated right, liberty, privilege, or use of another entity's property, distinct from ownership, without profit or compensation; a right-of-way.

A measure of air purity that is equal to one complete air change (in an interior space).

The cutting of a grid pattern of grooves in a semiconductor material, generally for the purpose of making interconnections.

A measure of the electrical resistance of a material equal to the resistance of a circuit in which the potential difference of 1 volt produces a current of 1 ampere.

A unit of electrical capacitance; the capacitance of a capacitor between the plates of which there appears a difference of 1 Volt when it is charged by one coulomb of electricity.

A unit or measure of electricity supply or consumption of 1,000 Watts over the period of one hour; equivalent to 3,412 Btu.

A turbine that is driven by high velocity jets of water or steam from a nozzle directed to vanes or buckets attached to a wheel. (A pelton wheel is an impulse hydroturbine).

Solid fuels made from primarily wood sawdust that is compacted under high pressure to form small (about the size of rabbit feed) pellets for use in a pellet stove.

Waste material from households and businesses in a community that is not regulated as hazardous.

A device for converting mechanical energy to electrical energy.

A space heating device that burns pellets; are more efficient, clean burning, and easier to operate relative to conventional cord wood burning appliances.