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Thermal power plants typically convert what percentage of the chemical energy of coal into electricity?
ALess than 10 percent
BAbout 30 to 40 percent
CAbout 90 percent
D100 percent
Answer & Solution
Correct answer: B. About 30 to 40 percent
1. Burning coal heats water to produce steam.
2. The steam drives a turbine connected to a generator.
3. Conversion is limited by the thermodynamic Carnot efficiency.
4. In practice modern plants convert about 30 to 40 percent of the chemical energy.
5. The rest is lost as waste heat to the cooling water and stack gases.
_Source: NCERT Class 10 Science Ch 14 'Sources of Energy' (byjus.com extract)_
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