Why are heat sources at high temperatures more useful than those at low temperatures? A geothermal plant (such as the Geysers in California—see Chapter 18, Section D) uses steam produced underground....

Why are heat sources at high temperatures more useful than those at low

temperatures?

A geothermal plant (such as the Geysers in California—see Chapter 18, Section

D) uses steam produced underground. Th e steam enters a turbine at a high temperature and pressure, emerging at a pressure below atmospheric pressure. Why is a

condenser needed in this plant?