ENERGY IS THE ABILITY of a body to do work We can also say that energy is 'stored work'. Energy is never lost ;it is coverted from one form to another .Human realized this hundred of years ago and wanted to build to build perpetual machine motion machine that keep moving without any input of energy .They have not succeeded yet.Today , we talk a lot about saving energy .
Energy can neither be created nor be destroyed . It can only be converted into the energy of movement callled kinetic Energy .When we shoot the arrow ,when we pick up stone ,we put energy in it.,if the stone falls down , it can do some work by hitting and damaging some object.
Though Energy is conserved ,every time it transferred or transformed ,some of it is lost..Every time when some work is done , energy is released is released in the form of heat through friction .Although heat is a form of energy , we can not use it to generate electricity or to make a car go. Most of it get radiated and is not available for use .For this reason we need to save fossil fuels , such as crude oil and coal , which are source of energy and are scarce.
SOURCE OF ENERGY.-All energy on the Earth comes from the Sun.Plants convert the energy from the sunlight into food substances through photosynthesis., and animals eat plants Crude oil and coal formed from the remains of dead animals and plants store solar energy.But from where does the sun get all energy from?.At the sun's core , atomic nuclei fuse together at extremely high temperatures. As a result of this fusion enormous radiation energy is released.Its energy is unlimited.But we use its energy in the form of hydro,or wind power,coal, crude oil, or biogas..
ENERGY CONSUMPTION DURING SLEEP.-Although there is no movement when we are asleep , our body consume some amount of energy .We need this energy because the brain , the heart, and other organs keep working even we are asleep. This energy comes from the food we eat and is measured in calories .The number of calories in different food is different.People doing hard work need more calories than people who don't Marmots use this trick, for instance ,in winter ,they have a winter sleep of one month,during which they consume very little energy .They thus live on food eaten earlier and can survive in places where food is scares because of frost or snow.
Currently three-fourth of all the energy on the earth is consumed by only around one-fourth of the population of the earth.
During the winter sleep , marmots reduce their body temperature .Their heart beats only two to three times per minute. instead of hundred times.
Energy can neither be created nor be destroyed . It can only be converted into the energy of movement callled kinetic Energy .When we shoot the arrow ,when we pick up stone ,we put energy in it.,if the stone falls down , it can do some work by hitting and damaging some object.
Though Energy is conserved ,every time it transferred or transformed ,some of it is lost..Every time when some work is done , energy is released is released in the form of heat through friction .Although heat is a form of energy , we can not use it to generate electricity or to make a car go. Most of it get radiated and is not available for use .For this reason we need to save fossil fuels , such as crude oil and coal , which are source of energy and are scarce.
SOURCE OF ENERGY.-All energy on the Earth comes from the Sun.Plants convert the energy from the sunlight into food substances through photosynthesis., and animals eat plants Crude oil and coal formed from the remains of dead animals and plants store solar energy.But from where does the sun get all energy from?.At the sun's core , atomic nuclei fuse together at extremely high temperatures. As a result of this fusion enormous radiation energy is released.Its energy is unlimited.But we use its energy in the form of hydro,or wind power,coal, crude oil, or biogas..
ENERGY CONSUMPTION DURING SLEEP.-Although there is no movement when we are asleep , our body consume some amount of energy .We need this energy because the brain , the heart, and other organs keep working even we are asleep. This energy comes from the food we eat and is measured in calories .The number of calories in different food is different.People doing hard work need more calories than people who don't Marmots use this trick, for instance ,in winter ,they have a winter sleep of one month,during which they consume very little energy .They thus live on food eaten earlier and can survive in places where food is scares because of frost or snow.
Currently three-fourth of all the energy on the earth is consumed by only around one-fourth of the population of the earth.
During the winter sleep , marmots reduce their body temperature .Their heart beats only two to three times per minute. instead of hundred times.
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