Alternate sources of energy
- We get most of our energy from fossil fuels-coal, petroleum and natural gas. But you know that their supply is limited and tat they cause pollution.
- Q~ what other sources of energy are being used? What are our scientists doing for future?
*Name the electricity produced in this way- hydroelectricity
A dam built in the path of a river uses the force of the flowing water to produce electricity.
Advantage: large amount of electivity, Produced no pollution.
Disadvantages; dams flood large areas of land cause environmental damage.
*Name of the cells- solar cells
Name of the energy source – solar energy
Special cells convert this limitless supply of energy into electricity.
Advantages: completely renewable; can be used anywhere; no pollution.
Disadvantages: require large area; cells are expensive to produce.
*Name the machine- wind mill
Name the type of energy it use-wind energy.
This machine converts this energy to electricity.
Advantage: no pollution
Disadvantages: each machine produces small amount of electricity; can only be used at certain places.
*Name the structure- biogas plant
Name the fuel- biogas
This energy is produced is produced from waste.
Advantages: renewable; plenty of waste available.
Disadvantages: pollution; problem of strong and transporting waste.
*Name of the fuel used in a fuel cell – hydrogen
Scientists are still working on this very promising energy source for the future. Energy is produced in a cell, called a fuel cell, by combing two gases to produce water.
Advantages: no pollution
Disadvantages: still very expensive to produce the fuel
*The splitting of atoms is called – fission
The energy so obtained is called – nuclear energy
The bomb which gets its energy from splitting of atoms is called the – Atomic
This energy producing by slitting the tiny atoms that makes up everything around us.
Advantages: can produce large amounts of electricity; normally no pollution.
Disadvantages: accidents can be disastrous: safe disposal of spent fuel is a great problem.
*Name the process were atoms are joined together: fusion
Which mighty bomb gets its energy from this process? - Hydrogen bomb
Scientists are now trying to get useful energy by joining atoms instead of splitting them. This does not have the dangers that splitting of atoms has. However, so, far results have been disappointing.
*Name of the alternate rising and falling of sea water: tides
Water in the sea alternately rises and falls. The force of rising and falling water can be used to the produce electricity.
Advantage: no pollution.
Disadvantage: cannot be used everywhere; only two such generating units in the world so for.
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