Download Natural Resources - Energy: Powering the Past, Present, and by Ph.d. Julie Kerr Casper PDF

By Ph.d. Julie Kerr Casper

This informative quantity comes at an incredible time, as international locations glance heavily towards replacement kinds of strength and the issues that might end result in the event that they don't. This booklet makes a speciality of Earth strength assets, comparable to renewable energy from water, ocean power, solar power, wind strength, and biofuels, in addition to non-renewable resources.

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Sample text

Although uranium is fairly common—about 100 times more common than silver—U235 is relatively rare. S. uranium is mined in the western United States. Once uranium is mined, the U235 must be extracted and processed before it can be used as a fuel. 91 metric tons) of ­coal. There are different types of nuclear power plants. Two types are used in the United States: ­ boiling-­water reactors (BWRs) and ­pressurized-­water reactors (PWRs). In the BWR, the water, heated by the reactor core, turns directly into steam in the reactor vessel and is then used to power the turbine generator.

Even though efficiency has increased, however, energy use has historically continued to ­rise. S. economy, and a lot of energy is used. S. Department of Energy, American consumers spend more than half a trillion dollars a year on energy. Energy is categorized into four principal uses: residential, commercial, industrial, and transportation. Over the years, industry has used the most ­energy. Energy sources have also changed over the years. In the commercial and residential sectors, coal was the leading source of energy until 1951, but then its use declined rapidly.

The ­rising ­import trend resumed by 1986 and, except for slight dips in 1990, 1991, and 1995, has continued ever since. S. petroleum imports reached an annual record level of 11 million barrels a ­day. Conservation and efficiency have become a trend in the recent past and the efficiency with which Americans use energy has improved over the years. Even though efficiency has increased, however, energy use has historically continued to ­rise. S. economy, and a lot of energy is used. S. Department of Energy, American consumers spend more than half a trillion dollars a year on energy.

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