(a) It leads to deforestation which causes problems like floods, erosion of fertile land and environmental imbalance
(b) It causes a lot of smoke and pollution.
(i)Fossil fuels are formed under the earth’s surface by a long process which takes million years to form fossil fuel and there are only limited reserves.
(ii) Fossil fuels are non – renewable sources of energy.
(iii) Burning of fossil fuels causes air pollution. The oxides of carbon, nitrogen and sulphur that are released on burning fossil fuels cause acid rain and other respiratory problems for human beings.
When sunlight falls over the solar cooker top, the sun rays pass through the glass sheet cover and get absorbed inside the cooker box. This glass sheet covers does not allow the solar energy to flow out in the form of radiant heat.Thus it traps more and more heat rays of the sun thereby producing green house effect.That is why glass lid is used in the solar cooker.
any solar cells combined in an arrangement is called Solar cell panels. The solar cells in the solar panel are connected in such a that total potential difference and total capacity to provide electric current becomes large
Ocean-thermal energy
Tidal energy
Wave energy
The two combustible components of biogas are methane (CH4) and hydrogen (H2).
Acid rains happens because burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere
These micro-organisms do anaerobic decomposition of slurry to form methane and other components of bio gas.
Fuel,Wind,Bio-mass,Charcoal
Fossils fuels are formed by degradation of natural substances which is extremely slow and takes millions of years for a natural substance to convert into fossil fuel.
The rate of consumption of the fossil fuels is far greater than that of its rate of formation which results into their fast depletion.
Hence they are called non-renewable resources.
Natural gas is primarily composed of methane, but also contains ethane, propane and heavier hydrocarbons.
Solar cell and Solar cooker
Solar cell mainly made of the semiconductor material Silicon and gallium which absorb the sun light efficiently. On an average, They produce voltage range of 0.4-0.5V.
The fission of an atom of uranium produces 10 million times the energy produced by the combustion of an atom of carbon from coal
(a)(i) These can be used anywhere as a self – generating source of electricity.
(ii) One constructed, there is no further cost of production or maintenance in such devices.
(b)The solar cell panels are mounted on specially designed inclined roof tops so that more solar energy is incident over it
Nuclear Fission.
In Nuclear fission, A heavy nucleus is bombarded with a low energy neutron. In this process, it splits into two lighter nuclei with a tremendous release of energy which can be utilized to boil water to run turbines
Uranium and plutonium
Nuclear energy is generated through the process of Nuclear Fission. In Nuclear fission, A heavy nucleus is bombarded with a low energy neutron. In this process, it splits into two lighter nuclei with a tremendous release of energy which can be utilized to boil water to run turbines.Uranium is used as the fuel
A concave mirror would be best suited for use in a solar cooker because it reflect and focus the sunlight at a point. The temperature at that point increases which heats and cooks the food placed at that point.
A good source of energy has following characteristics:
(i)It could do a large amount of work per unit volume or mass.
(ii) It would be easily accessible.
(iii) it would be easy to store and transport.
(iv) It would be economical.
