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Sources of Energy in the World

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Energy of the World

Physics Holiday Homework

Aadharsh. D

1,131 words (excluding cover page and bibliography)

What is energy?

Energy is one of the most fundamental parts of our universe.

We use energy to do work. Energy lights our cities. Energy powers our cars and motorcycles. Energy warms our homes, cooks our food and plays our music. Energy powers machinery in factories and tractors on a farm.

Energy from the sun gives sunlight during the day. It helps plants grow. Energy stored in plants is eaten by animals, giving them energy. And predator animals eat their prey, which gives the predator animal energy.

Everything we do is connected to energy in one form or another.

Energy is defined as:  "the ability to do work."

When we eat, our bodies transform the energy stored in the food into energy to do work. When we run or walk, we "burn" food energy in our bodies. But where does energy come from?

Sources of Energy

We get our energy from many sources on this planet. These sources can be mainly divided into two categories:

Sources of Energy

Nonrenewable Energy

Renewable Energy

Renewable Energy

Renewable energy is energy which comes from sources that can be replenished. These sources never die out and there is no pollution when you use them. The most common renewable sources are:

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Geothermal: Geothermal energy is energy obtained by tapping the heat of the earth itself, both from kilometers deep into the Earth's crust in some places of the globe or from some meters in geothermal heat pump in all the places of the planet. Ultimately, this energy derives from heat in the Earth's core.

Energy in its different forms:

The First Law of Thermodynamics says that “energy under normal conditions cannot be created or destroyed, simply transformed from one type of energy to another”. Thus a chemical reaction such as lighting a match does not create new energy but only converts one type of energy to another. What's happening with the match is that as the match is burnt, potential energy is released and converted to heat and light, kinetic energy.

Kinetic Energy: Kinetic or mechanical energy is the most familiar form of energy.  It is the energy a substance or system has because of its motion.  Every moving object has mechanical energy. A simple example of this is a moving car.image01.jpg

Potential Energy: This is energy which an object has because of its changed position, shape or state.

Electrical Potential Energy:Electrical energy is the energy carried by moving electrons in an electric conductor.

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"The Energy Story - Introduction." Energy Quest Room. Web. 16 Dec. 2010. <http://www.energyquest.ca.gov/story/index.html>.

"Laws of Energy." JCCC Staff and Faculty Pages. Web. 16 Dec. 2010. <http://staff.jccc.net/pdecell/metabolism/thermodyn.html>.

"Renewable Energy." Wikipedia, the Free Encyclopedia. Web. 16 Dec. 2010. <http://en.wikipedia.org/wiki/Renewable_Energy>.

Crem Ltd - Home Energy Ratings. Web. 16 Dec. 2010. <http://www.crem-ltd.com/renewables_hydro.html>.

"Mechanical Energy." Railroad Commission - Energy Education Programs - Energy Curriculum. Web. 16 Dec. 2010. <http://www.energyeducation.tx.gov/energy/section_1/topics/forms_of_energy/mechanical_energy.html>.

"Examples Of Kinetic Energy | Tutorvista.com." Tutorvista.com - Online Tutoring, Homework Help for Math, Science, English from Best Online Tutor. Web. 16 Dec. 2010. <http://www.tutorvista.com/physics/examples-of-kinetic-energy>.

"Law of Conservation." Railroad Commission - Energy Education Programs - Energy Curriculum. Web. 17 Dec. 2010. <http://www.energyeducation.tx.gov/energy/section_1/topics/law_of_conservation/index.html>.

"Conservation of Energy." Wikipedia, the Free Encyclopedia. Web. 17 Dec. 2010. <http://en.wikipedia.org/wiki/Conservation_of_energy>.

"Forms of Energy." Railroad Commission - Energy Education Programs - Energy Curriculum. Web. 17 Dec. 2010. <http://www.energyeducation.tx.gov/energy/section_1/topics/forms_of_energy/index.html>.a

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