more than enough energy to satisfy global energy needs for an entire year. Solar energy is the technology used to harness the sun’s energy and make it useable. Solar Energy is the energy from the Sun. The Sun is a big ball of heat and light resulting from nuclear fusion at its core. The nuclear reaction releases energy that travels outward to the surface of the Sun. Along the way to the surface the energy transforms so that by the time it is released it is primarily light energy. The two major
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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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Energy Resource Plan As the power bill is nearing to be three times as much as it has been‚ one thing on every household’s mind is‚ how are we going to conserve energy? Conserving energy is more than just “saving the planet”. It is preserving earth for future generations‚ your kids‚ your grandkids‚ and your lineage. We need to treat the earth like a precious family heirloom that is nearing its breaking point. There are two categories of energy: renewable and nonrenewable. Renewable energy comes
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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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Work & Energy Physical Science Ms.Barconey May 8‚ 2013 Work is the transfer of energy to an object by the application of a force that causes the object to move in the direction of the force. Three examples of work would be a tractor pulling a float‚ a mother pushing a baby stroller‚ and a body builder lift a barbell over their head. Work is measured in joules and the formula for work is Work=Force*Distance. Power is a quantity that measures the rate at which work is done
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examples of work done=force x distance What is work? Work in physics is the transfer of energy; work is done on an object when an applied force moves it through a distance. The link between work and energy is work done equals energy transferred. The units for the two are also the same (joules). E.g. 500J of work = 500J of kinetic energy. Work is calculated with the formula: work done=force x distance moved For example‚ if a force of 10 newton (F = 10 N) acts along point that travels 2 meters
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Energy Management H.W 1 1. A hospital is considering the purchase of a large commercial laundry dryer‚ and is attempting to decide between an electric and natural gas powered system. If electricity costs $0.06/kWh and is used with an efficiency of 90%‚ what is the equivalent price of natural gas per therm if it can be burned with an efficiency of 80%? Dimensional Analysis |$.06 |29.3 KWh |.8 efficiency | |.90 efficiency |1 therm
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Renewable Energy is Best Michelle Johnson HUM/111 March 26‚ 2011 L. Flemister Renewable Energy is best America’s dependency on foreign oil is costing us more than just money; it costs us our clean air and potentially thousands of jobs in America. Our nation needs to create its own renewable energy. The dependency on other countries is crippling our economy. Drilling for oil in the United States is not the answer. We need to take better care of our planet and that each of us must
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Hydraulics Prof. B.S. Thandaveswara 9.3 Application of Specific Force and Specific Energy 1. Determine the energy Loss in a NHJ Solution: Applying Momentum equation γQ ( V2 − V1 ) = P1 − P2 g γ Q 2 ( y1 − y 2 ) gb 2 y1y 2 2 2 2 = y1 − y 2 ( ) Q2 2gb Q2 b 2 = ( y1 + y2 ) y1y2 4 = q2 q 2 ( y1 + y 2 ) y1y 2 = (1) 2g 4 Specific energy equation y1 + V12 V2 = y 2 + 2 + ∆E 2g 2g Q2 2 2gy1 b 2 ∆E = y1 + − y2 − Q2 2 2gy 2 b 2 1 ⎤ q2 ⎡ 1 ∆E = ( y1 − y
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Energy in food lab report Aim: How much energy there is in food. Hypothesis: If I work out how much the water temperature has risen by burning food underneath water‚ the mass of the water and the mass of food I can work out how much energy was in the food. Introduction: This experiment is about how much energy there is in food. There are a few different types of energy‚ the one we are looking at is chemical energy. Some other types of energy are: thermal energy which is heat‚ magnetic energy which
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