Question

Which of the following represents the correct order of energy change in Thermal power stations?

• A. Heat energy→Chemical energy→Mechanical energy→Electrical energy
• B. Chemical energy→Heat energy→Mechanical energy→Electrical energy
• C. Chemical energy→Kinetic energy→Mechanical energy→Electrical energy
• D. Chemical energy→Kinetic energy→Electrical energy

Answer 1

The correct option is B

Chemical energy→Heat energy→Mechanical energy→Electrical energy

Fuels like coal or lignite are ignited to convert chemical energy to heat energy. Then, the heat energy is used to convert water into steam. This steam is used to rotate the turbine connected to the generator. The generator converts the mechanical energy of the turbine to electrical energy.
Hence the energy change is
Chemical energy→Heat energy→Mechanical energy→Electrical energy