Chapter Summary
Easily accessible, economical and easy to transport
Should do large amount of work per unit of mass or volume
Are in use since a long time.
Examples: coal, petroleum, firewood, hydel energy, wind energy
Have come into use recently.
Examples: Solar energy, nuclear energy, energy from sea, geothermal energy
Also called fossil fuels.
Are non-renewable.
Use of fossil fuels causes air pollution.
It is produced by using kinetic energy of water.
Kinetic energy of water is utilized to turn turbines to produce electricity.
It is renewable source of energy.
Windmills were traditionally used for flour mills and saw mills.
Wind energy is now used for generating electricity.
Solar energy is converted to electrical energy by means of solar panels.
Solar energy is also used in solar furnace.
Tidal energy and wave energy harnesses kinetic energy of water to generate electricity.
Ocean thermal energy uses temperature differential in ocean water to produce electricity.
Molten rocks inside the earth are pushed at certain hot spots on the earth.
This heat causes groundwater to turn into steam which can be utilized to generate electricity.
Fission of atom creates huge amount of energy.
This energy is utilized to produce electricity.