Ch. 20 Terms
Terms in this set (26)
The percentage of energy put into a system that does useful work
hybrid gasoline-electric engines
a small gasoline engine generates electricity that is stored in batteries and powers electric motors that drive vehicle wheels
Vehicles with hybrid engines that can be plugged in to recharge the electric portion of the engine
the generation of electricity and other energy jointly, especially the utilization of the steam left over from electricity generation to produce heat.
passive heat absorption
The use of natural materials or absorptive structures without moving parts to gather and hold heat; the simplest and oldest use of solar energy.
active solar system
A mechanical system that actively collects, concentrates, and stores solar energy.
Corporate Average Fuel Economy standards enacted into law in 1975, established fuel efficiency standards for passenger cars and light trucks. The fuel economy ratings for a manufacturer's entire line of passenger cars must currently average at least 27.5 mpg for the manufacturer to comply with the standard.
mechanical devices that use hydrogen or hydrogen-containing fuel, such as methane, to produce an electric current; clean, quiet, and highly efficient sources of electricity
Fuels, such as ethanol or methanol, that are created from the fermentation of plants or plant products.
small-scale technology that can extract energy from small headwater dams that cause much less damage than larger projects
Ordinary river flow not accelerated by dams, flumes, etc. Some small, modern, high-efficiency turbines can generate useful power with run-of-the-river flow or with a current of only a few kilometers per hour.
ocean thermal electric conversion (OTEC)
the use of temperature differences in ocean water to produce electricity
light-emitting diodes (LEDs)
semiconductor light sources used as indicator lamps in many devices and for general lighting
Energy saved through conservation.
photovoltaic cell (PV cell)
a semiconductor device that converts the energy of sunlight into electric energy.
A high-temperature concentrating solar power system in which thousands of mirrors arranged in concentric rings around a tall central tower track the sun and focus light on a heat absorber to generate steam, which drives an electrical generator.
property assessed clean energy (PACE)
A program that uses city bonds to pay for renewable energy and conservation expenses, such as solar power and insulation.
Require utilities to buy surplus power from small producers at a fair price. These tariffs are generally essential to individual solar installations.
Standards to require power suppliers to obtain a minimum percentage of their energy from sustainable sources
allows utilities to profit from conservation programs and charge premium prices for renewable energy
rotating machine that converts kinetic energy of wind into mechanical energy
A device measuring electricity consumption that allows for two-way wireless communication between the utility and consumer
Converter that strips hydrogen from fuels such as natural gas, methanol, ammonia, gasoline, ethanol, or even vegetable oil
coal can be mixed with biomass fuels to produce energy with less carbon dioxide emissions.
biofuel produced from wood, grasses, or the non-edible parts of plants
Energy derived from the heat in the interior of the earth
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