Energy transfers which take place in living organisms The nucleotide ATP (adenosine triphosphate) maintains both catabolic and anabolic reactions. Catabolic reactions e.g. respiration are where larger molecules are broken down into smaller ones with energy being released‚ and anabolic reactions e.g. photosynthesis are where smaller molecules are built up into larger ones which require energy. Catabolism provides the energy for organisms to synthesise larger molecules in its anabolic reactions.
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Calculating Efficiency. Efficiency (%) = Useful Energy Out x 100 Total Energy In Questions 1) A light bulb takes in 30J of energy per second. It transfers 3J as useful light energy and 27J as heat energy. Calculate the efficiency. 2) A kettle takes in 2000J of energy per second. It transfers 1500J as useful heat energy and 500J is wasted as sound energy. Calculate the efficiency of the kettle. Remember: In the exam they may not
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Potential Energy Potential Energy is a type of energy that does not involve motion. It is the energy that is stored up. The more work done to change an object’s position or shape‚ the more potential energy it has. For example‚ a person on a ladder has more potential energy than a person on the ground because they have done more work to get up there. Kinetic Energy Kinetic Energy is the energy of motion. The more work an object has done‚ the more kinetic energy it has. the amount of kinetic
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Kinetic Energy: Consider a baseball flying through the air. The ball is said to have "kinetic energy" by virtue of the fact that its in motion relative to the ground. You can see that it is has energy because it can do "work" on an object on the ground if it collides with it (either by pushing on it and/or damaging it during the collision). The formula for Kinetic energy‚ and for some of the other forms of energy described in this section will‚ is given in a later section of this primer. Potential
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ENERGY USAGE IN INDIAN URBAN HOUSEHOLDS: THE ROLE OF RENEWABLE ENERGY TECHNOLOGIES Gopala Krishnan K‚ Malathy Duraisamy‚ L S Ganesh Industrial Engineering and Management Division‚ Department of Humanities and Social Sciences‚ Indian Institute of Technology‚ Madras‚ Chennai 600 036‚ INDIA ABSTRACT DEMAND FOR ENERGY.................... This study attempts to understand the dynamics of energy use in the urban residential sector. For this purpose‚ a household survey was conducted
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2008 Energy conservation is the elimination or reduction of energy we and waste every. Energy is a very important to our society. We use energy for everything transportation‚ cooking‚ heating and cooling‚ manufacturing‚ lighting‚ and entertainment. Energy is the vital force powering business‚ manufacturing‚ and the transportation of goods and services to serve the American and world economies. Can you imagine what life would be like if we did energy? Every year the United
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Endocrinology 142(10):4163– 4169 Copyright © 2001 by The Endocrine Society Minireview: Ghrelin and the Regulation of Energy Balance—A Hypothalamic Perspective TAMAS L. HORVATH‚ SABRINA DIANO‚ PETER SOTONYI‚ MARK HEIMAN‚ ¨ MATTHIAS TSCHOP AND Reproductive Neuroscience Unit (T.L.H.‚ S.D.)‚ Department of Obstetrics and Gynecology and Department of Neurobiology (T.L.H.)‚ Yale Medical School‚ New Haven‚ Connecticut 06520; Department of Anatomy and Histology (P.S.)‚ Faculty of Veterinary Science‚ Szent Istvan
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Alternate Energy What would it be like to live in the dark? Finding new forms of alternative energy has been a major concern throughout the world for the past several years. Currently‚ our main sources of energy are coal for electricity‚ and oil for transportation. Alternative energy‚ also known as renewable energy‚ is defined as energy derived from sources that do not use up natural resources or harm the environment. At the rate we are using these nonrenewable resources oil is scheduled to run
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Dark energy what is it? Dark energy is a unknown energy said to take up 70 percent of the universe. The energy is a repulsive gravitational effect that is causing the universe to accelerate out-ward. No one knows exactly what dark energy is or where it comes from. Dark Energy is a new idea. Little is known about dark energy‚ yet it takes up a huge amount if the universe. Scientist were able to show the universe was expanding at an accelerated rate by measuring the red-shift of an object by comparing
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issues in today’s world is that of energy sources to power an increasing global demand. Traditionally‚ humans have converted energy from natural resources like coal and natural gas for use. However‚ these sources of energy are both nonrenewable and cause large amounts of pollution. As we progress through the 21st century‚ renewable energy sources like solar and wind energy will see increased use to replace traditional sources. One of these sources‚ wind energy‚ is seeing a rise in development because
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