18. How the heat from the earth is tapped as a source of electricity in a power plant?
A. >electrical energy>mechanical in a turbine>mechanical energy of a generator.
C. >mechanical energy of a generator>mechanical energy in a turbine>electrical energy.
B. >mechanical energy in a turbine>mechanical energy of a generator>electrical energy.
D. >mechanical energy in a turbine>electrical energy>mechanical energy of a generator.