Science Vocabulary free essay sample

Chapter 18 Vocabulary †¢Energy Efficiency- Percentage of the total energy input that does useful work and is not converted into low-quality, usually useless heat in an energy conversion system or process. See energy quality, net energy. †¢Incandescent Light Bulb- One largely used devices that uses large amounts of energy, wastes 95% of its energy input of electricity †¢Internal Combustion Engine- Another device that uses a lot of energy, wastes 75%-80% of the energy in its fuel Coal-Burning Power Plant- Device that uses a lot of energy, wastes 66% waste †¢Net Energy- only energy that really counts †¢Net Energy Efficiency- a measure of the useful energy we get from a resource after subtracting the energy used and wasted to make energy available †¢Cogeneration- Production of two useful forms of energy, such as high-temperature heat or steam and electricity, from the same fuel source. †¢Super insulated house- House that is heavily insulated and extreme ly airtight. Typically, active or passive solar collectors are used to heat water, and an air-to-air heat exchanger is used to prevent buildup of excessive moisture and indoor air pollutants. We will write a custom essay sample on Science Vocabulary or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page †¢Green roof- covered with plants, provide good insulation, absorb storm water, outlast conventional roofs, and make a building more energy efficient †¢Photovoltaic (PV) cell- Device that converts radiant (solar) energy directly into electrical energy †¢Solar Cells- used to produce electricity †¢Hydropower- Electrical energy produced by falling or flowing water Turbine- produce electricity †¢Biofuel- Gas or liquid fuel (such as ethyl alcohol) made from plant material (biomass) †¢Geothermal- Heat transferred from the earths underground concentrations of dry steam (steam with no water droplets), wet steam (a mixture of steam and water droplets), or hot water trapped in fractured or porous rock. †¢Micro power Systems- Systems of small-scale decentralized units that generate 1-10,000 kilowatts of electricity. Examples include micro turbines, fuel cells, and household solar panels and solar roofs