This document discusses fossil fuels, their formation and uses as energy sources. It notes that fossil fuels contain carbon and hydrogen, and when combusted produce heat energy that can be converted to electrical or mechanical energy. It classifies fuels as solid, liquid or gaseous, and discusses biofuels and their environmental impacts. Specifically, it explains the greenhouse effect where greenhouse gases like carbon dioxide absorb and radiate the sun's heat, warming the Earth's atmosphere.
17. Energy conversion from fossil fuels
✓Fossil fuels contain combustible elements, carbon and hydrogen
✓On combustion they produce heat which is further converted into electrical
energy in generators
✓Heat energy is also converted into mechanical energy in I C engines for
running mainly automobiles
✓ fossil fuel cells are used to generate electricity
18.
19. FUELS
✓A combustable substance containing Carbon as the main
combustible element which on complet combustion liberates large
quantity of heat are called fuels.
✓Fuel + Oxidizer = Combustion Products + Heat Energy
✓In general the fuels are classified in three groups based on its
phase
✓ Solid fuels
✓Liquid fuels
✓Gaseous fuels
50. GLASS HOUSE / GREEN HOUSE ( where the climate is cold)
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53. Mechanism of Green house effect
➢Solar radiation that reaches the earth’s atmosphere has shorter
wavelength and some of it is absorbed by the earth and the rest
is reflected back with high wave length infrared rays
➢These long wavelength less energy radiations are absorbed by
green house gases and throw them in all directions because of
which earth’s atmosphere get’s heated
➢This effect is also observed in cars
