Energy, Ecology, and the Environment - download pdf or read online


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Sample text

There is heat loss at the walls of the furnace and elsewhere. (2) Not all of the steam does "productive" work. It cools down a bit, there are losses due to internal friction in the gas, etc. (3) Friction in the turbine blades and generator produces waste heat. The wires conducting the electricity have a certain amount of electrical resistance which causes energy losses in the form of heat as the electricity is transmitted to the home. Not counting the losses due to the appliances in the home, the system in the diagram, in the case of a typical power plant, is only 30% efficient.

Thus we list this source as a continuous one on our list of economically recoverable fuels (Table 2-5). At the present time, no clearly promising scheme has been proposed to bring all of this energy to the surface, but we are encouraged to look further and to see what fraction of it can be used. Directly beneath the crust of the Earth, the molten mass of the mantle (called magma) is still in the process of cooling. In some places, earth tremors of the early Cenozoic era have caused fissures to open and the magma to come quite close to the surface.

There is a peak 20 WORKSHEET 1-4 Conservation of Energy We shall look at a 10 kg mass lifted 5 m above the ground. (1) Find the work done in lifting this mass: Work = Force x Distance = X j (=N-m) This work has now become gravitational potential energy. By the conservation of energy the potential energy must be j. To deter­ mine a formula for gravitational potential energy, we take into consid­ eration: (a) The potential energy increases with the height above the ground. (b) The potential energy increases with the weight of the body.

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