Environmental and energy glossary
Energy from resources that are regenerative
or for all practical purposes cannot be depleted,
such as moving water, biomass, geothermal
energy, solar energy and wind energy.
Using an item more than once, often by repairing,
donating or selling the item.
R-value: A measure of the ability of a material to resist the transfer of heat. The larger the R-value of a material, the greater the insulating properties.
energy: Electromagnetic energy transmitted
from the sun. The amount that reaches the
earth is equal to one-billionth of total solar
Source reduction: Waste prevention, or consuming and throwing away less by purchasing durable, long-lasting goods, seeking products and packaging that are as free of toxics as possible, and redesigning products to use less raw material in production, have a longer life, or be used again after its original use. Reuse is part of source reduction.
water heater: A water heater that heats
water before it is directly distributed for
end use as required or on demand.
pane (window): A window with three
layers of glazing, with airspace separating
the middle glass from both the exterior and
A unit of electrical force, it equals the
amount of electromotive force to cause a steady
current of 1 ampere to flow through a resistance
of 1 ohm.
Voltage: The amount of electromotive force, measured in volts that exists between two points.
The rate of energy transfer equivalent to
one ampere under an electrical pressure of
one volt. One watt equals 1/746 horsepower,
or 1 joule per second.
A unit of electricity consumption of 1 watt
over the period of 1 hour.
Wattmeter: A device for measuring power consumption.
A term used for a wind energy conversion device
that produces electricity; typically having
one, two or three blades.