“Energy is the ability of a body to do work.”It is present everywhere in sunlight,water,wind,plants,animals etc..It is required for walking, reading and playing.Energy does makes things for us like makes toast,plays music etc..A good source of energy would be the one which would:
- Do a large amount of work per unit volume or mass.
- Be easily be accessible
- Be easy to store and transport.
- It should be economical
List of sources of energy
- Wind energy
- Hydal energy
- Fossil fuel energy
- Nuclear energy
- Geothermal energy
- Solar energy
- Tidal energy
Fossil fuel energy
Fossil fuel is a hydrocarbon deposit,such as petroleum,coal,or natural gas,derived from living matter of a previous geological and used for fuel.
Tidal energy ,sometimes called tidal power,is the power achieved by capturing the energy contained in moving water in tides and ocean currents.
The huge moving waves possess kinetic energy.This energy is used to power a turbine.Most wave energy systems are very small.But,they can be used to power a warming bouy or a small light house.
Ocean Thermal energy:
The energy obtained by converting the solar energy trapped by the ocean into useable energy is known as ocean thermal energy.The water at the surface of the sea or ocean is heated by the sun while the water,in deeper sections is relatively cold.This difference in temperature is exploited to obtain energy in ocean thermal energy conversion plants.These plants can operate only if the temperature difference between the water at the surface and water at depths up to 2km is 293k 20 0 c or more.
Geo thermal energy
“Energy obtained by tapping underground reservoirs of heat ,usually near volcanoes or other hot spots on the surface of the earth is known as geothermal energy.”
“Solar energy is the solar radiation that reaches the earth.”
Uses of solar energy
- Heating water for domestic use
- Space heating of buildings
- Heating sweaming pools
- Drying agricultural products
- Generating electrical energy
Draw backs of solar energy
- It arrives the earths surface intermittently and in variable manner.
- It has to be concentrated using parabolic mirrors.
“A solar cell is a device that converts solar energy into electricity.”A typical solar cell develops a voltage of 0.5 – 1 volt and can produce about 0.7 watt of electricity when exposed to the sun.
Uses of solar cells
- Artificial satellites and in space probes like Mars orbiters.
- Wireless transmission systems or Tv relay stations in remote locations.
- Traffic signals,calculators and in toys.
The source of this energy is water at some height.To store this water at height various dams are constructed.This water is also used to derive electrical generation.The electricity thus produced is used for different purposes.