Answer to Question 1
Low-temperature resources have a temperature less than 90o C (194o F). The lower temperature resources are used for heating buildings, fish farming, bathing and even snow melting (in places like Iceland with a very large geothermal resource.)
High-temperature resources have a temperature greater than 150o C (302o F). These resources are generally used for electrical generation and can drive steam turbines directly.
In between low-temperature resources and high-temperature resources are moderate-temperature resources.
Answer to Question 2
The main parts include the production well, steam turbine, alternator (generator), condenser, cooling tower and an injection well.
When operating, steam enters the turbine and causes it to spin. As the steam loses its energy, the temperature drops and the steam condenses. A separate condenser cools the steam and it condenses to water (creating a lower pressure in the process). The turbine is connected to a generator, which produces electricity. The condenser is cooled from make-up water and water that is evaporated in the cooling tower. Water is returned to the reservoir via an injection well
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