Which of the following sequence correctly represents energy conversion in a conventional coal-fired power station ?
Chemical → Thermal → Mechanical → Electrical
Trace the energy through the plant in the order the equipment appears.
Coal holds chemical energy in its carbon bonds. Burning it in the boiler releases that as thermal energy, which converts water into high-pressure steam.
The steam is expanded through a turbine, and the spinning shaft carries mechanical energy.
The turbine shaft drives the alternator, where a rotating magnetic field induces an electromotive force and delivers electrical energy to the grid.
Hence, the sequence is Chemical → Thermal → Mechanical → Electrical.
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