Note: "electricity" is not conducted, only electrical current (the flow of electrons) is. Electricity is the field that covers all things electrical. Insulators only prevent the flow of electrons (current).
Glass is a very good insulator.
To understand the potential of "biomass" as a fuel supply, it is necessary to understand the term in the first place. Biomass refers to material of recent biological origin from which energy or energy-rich compounds can be derived.
Biomass has been used for all of human history as a fuel source. Inits most crude form, the burning of stalks, wood, dung, and the like as domestic fuel is the use of biomass. Such conversions (the burning) tend to release little of the available energy and produces large amounts of pollution because of its incomplete combustion.
Biomass, as it is used today, typically refers to the conversion of mass crops such as corn, rice hulls, switch grass, and other agricultural products or byproducts in to either electricity or high-density fuel storage compounds (ethanol, for instance).
To convert biomass into electricity, it is typically burned under close supervision (so as to maximize the actual combustion process). The burned biomass releases heat which boils water which, in turn, turns large electric turbines. This is, in fact, much the same method that is used in nuclear plants (with nuclear reactions being replaced by burning biomass). In this way, there is a wide availability of resources "to burn."
Some plants can be converted into other compounds; corn is the product that is used to produce ethanol. Such a process is now, through dedicated research, finally becoming economically viable.
A downside of this is that each crop generally requires a different fuel-production process. Another downside, one that is rarely mentioned, is that for such crops to be grown in the amounts that they have to be to satisfy modern societies, massive amounts of fertilizer are necessary. Corn, for instance, is well-suited to produce ethanol because, among other reasons, corn holds a lot of energy. This energy comes mainly from the sun but also from the nitrogen in the various compounds inside corn. The solar energy is stored within the bonds of the nitrogen compounds by "fixing" (that is, "nitrogen fixing")- making molecules with the potential energy stored as chemical bonds with nitrogen atoms. This nitrogen comes from the soil. The natural land cannot support such a massive debt of nitrogen and crops that grow on this land are forced to rely on the nitrogen from commercial fertilizers such as ammonia. Production of this fertilizer generally requires intensive use of petroleum. It should also be noted that massive fertilization practices are also changing the natural fabric of rural environments in ways that science is just beginning to understand.
Biomass-derived fuels tend to burn much cleaner than their petroleum counterparts; this is typically the tagline associated with their use, and it does typically hold true.
Biomass as a fuel source does have its drawbacks, but there are also numerous benefits to its use and further research. It is important, however, to remember that there is no single panacea to the need for energy. The eventual solution will involve many different brands of "alternative energy" and biomass will likely be among the most viable.
The simplest answer is that the electric utility uses a transformer across 2 of the 3 hot leads to develop a single hot lead with an earth reference. What follows below is frequently edited by both amateurs and professionals, with mixed results. Wikipedia is a better source of more detailed information on this subject, in part because the article on three phase power has pictures.
It doesn't really, but it does keep the colder air from reaching it hence the affect of the melting process. It's okay for thin ice and mostly clear ice, but not if you're trying to break a chunk off your roof. If this is a question for homework, the answer is this: Salt doesn't melt ice. Instead, the properties of salt repel cold air and attract warmer air, seemingly melting the ice. It is efficient for sidewalks and small portions, but not for larger jobs. The ice does melt because the salt makes the freezing rate lower
* Null hypothesis is whether there is a difference or not. Null hypothesis (H0) is a stated assumption that there is no difference in parameters (mean, variance, DPMO) for two or more populations. According to the null hypothesis, any observed difference in samples is due to chance or sampling error.
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