Chapter 6: Sources of Energy

The sun as the primary source of Energy

-Sun is the primary source of energy for earth
-Generates a large amount of energy through nuclear fusion – hydrogen atoms combines to form helium atoms- releasing a large amoun of heat and light energy
-Earth receives the het energy and light energy from the Sun
-Life on earth depends on energy from the sun
-Energy in the wind, waves and rain comes indirectly from sun- wind due to the suns heat energy causing the air to move
-Among the energy from the sun includes

• Energy in the wind, waves and rain


• Energy in fossil fuels ( natural gas, petroleum, coal)


• Energy in plants, animals and human beings


• Energy for operating appliances (solar calculators, solar cookers)

The principle of Energy Conservation

• Energy cannot be created or destroyed
• Energy can be changed from one form to another – with condition that the total energy before and after remains the same – Energy is conserved
• During the energy change, some energy may be wasted (usually in the form of heat ) but never destroyed

Click the below link to watch the video on Energy
Energy

Renewable and Non-renewable energy sources
Renewable sources – Energy sources that are always available (energy source that cannot be used up)

Non-renewable sources – Energy sources which will be used up one day

The link below is the video on Renewable and Non-Renewable Resources
Renewable Vs Non-Renewable Resources