Given zeo fuel mass 4920 trip fuel

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Characteristics of a good source of fuel :-i) It should have A high energy output per unit mass or volume.

ii) It should be easily available.Iii) It should be easy to store and Transport.Iv) It should be economical.

Sources of energy :-

Conventional sources of energy :- are wood, flowing water& fossil fuels (coal, petroleum, natural gas).

Non conventional sources of energy :- are solar energy, Wind energy, biomass energy, ocean energy (tidal energy, wave energy, ocean Thermal energy), geothermal energy, nuclear energy etc. Some sources of energy Are renewable like sun, wind, flowing water, ocean, wood, biomass etc. Some Sources of energy are non renewable like coal, petroleum and natural gas.

Fossil fuels :- are fuels formed inside the earth from the Remains of plants and animals after millions of years. The fossil fuels are Coal, petroleum and natural gas. Fossil fuels are non renewable sources of Energy so they should be conserved and used judiciously.

Disadvantages of fossil fuels :-

i) Burning of fossil fuels release gases and harmful particles which causes Air pollution.

ii) Burning of fossil fuels release acidic oxides of sulphur and nitrogen Which causes acid rain which is harmful for living organisms, affects soil and Water, causes damage to buildings, corrosion of metals etc.

iii) Burning of fossil fuels release a large amount of carbon dioxide gas Which increases the temperature of the atmosphere and causes global warming (green house effect).

Thermal power plants :-In thermal power plants the heat energy produced By burning fossil fuels like coal, petroleum or natural gas is used to heat Water and change it into steam which rotates the turbines of generators to Produce electricity.

Hydro power plants In hydro power plants water from rivers are Stored by constructing dams. The water from the dam flows down through pipes And rotates the turbines of generators to produce electricity.

Advantages :-i) Flowing water is A renewable source of energy.Ii) The electricity produced does not cause Pollution.Iii) The water stored in dams can also be used to control floods andfor Irrigation.

Disadvantages :-

i) The initial cost is high.Ii) Large areas of land gets submerged and the Decomposition of

vegetation produces methane gas which is a green house gas.

iii) It causes displacement of people from large areas of land.

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