Resistance in a Conductor: The electrical resistance of an electrical conductor is the opposition to the passage of an electric current through that conductor. Electrical resistance shares some conceptual parallels with the mechanical notion of friction. The SI unit of electrical resistance is the ohm (Ω).An object of uniform cross section has a resistance proportional to its resistivity and length and inversely proportional to its cross-sectional area. All materials show some resistance‚ except
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“Who Killed the Electric Car? 2006 Documentary Written and directed by Chris Paine and produced by Jessie Deeter. 1. Summarize the content of this movie. Keep it to the space below‚ please. Electric car was around in 1960s. During the energy crisis in 1970s and 1980s electric cars started disappearing. In 1990s first electric car EV1 from a company named General Motors became popular in California simply because it was more environmental-friendly while it was affordable. A Zero-emissions
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3. Ohm’s law is represented by the equation I = V/R. Explain how the current would change if the amount of resistance decreased and the voltage stayed the same. Ohm’s law states current is dependent on voltage and resistance. As in any mathematical equation if we change one variable in the equation on one side and leave the other variable constant‚ the other side of the equation will change as well. In this case since current is equal to voltage divided by resistance. If we keep voltage the same
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| Who Killed The Electric Car | By James Walker | | | | | James Walker STL 100 Who Killed the Electric Car The electric car introduced in 1996 and was popular in California. The car was quiet small and produced no exhaust; it was a product that was loved by consumers and eco-friendly. This idea of the electric car was not one that was recent in implementing; about 100 years ago there were more electric cars than there were gas cars and they ran really well and quiet. The
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Einstein). Electric cars are automobiles they use one or more electric motors‚ other than using more common gasoline powered engines. Electric cars use batteries; batteries are used to store energy. Since Electric motors don’t have to warm up they have instant torque‚ creating strong and smooth acceleration‚ which can give you a more satisfying ride. Electric cars are safer and better than gasoline powered cars‚ since they aren’t polluting the air as much as gas powered cars. Electric cars are high
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What are electric cars and how do they help our environment? An electric car is an automobile that is propelled by one or more electric motors‚ using electrical energy stored in rechargeable batteries or another energy storage device. Electric motors give electric cars instant torque‚ creating strong and smooth acceleration. They are also around three times as efficient as cars with an internal combustion engine. The first practical electric cars were produced in the 1880s. Electric cars were popular
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scientific foundation to the subject. Electrical engineers can use physics as the foundation of their activities. As a result the measures they use in their daily work‚ such as Volt and Ampere‚ correspond to well defined phenomena (electric potential‚ electric current)‚ and satisfy the rules and properties defined by theories of measurement‚ such as the representational theory [11]. The models they use‚ such as the Ohm’s law‚ are experimentally validated and expressed in mathematical form. In
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of a material or electronic component‚ usually in ohms. Ohmmeters typically use an ammeter to measure current through the material after it has been given some set voltage by the ohmmeter; the direct-current resistance of the sample can then be directly determined through Ohm’s law. Resistance is measured in ohms. It can be calculated from the potential difference across a component and the current flowing through it. The total resistance of a series circuit is the sum of the resistances of the components
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Memorandum To: Whom It May Concern From: Yiying “Rachel” Cao Date: 3/6/2013 Subject: Analysis of who killed the electric car Background The problem In 1990s‚ California was threatened by smog problem‚ and black cloud appeared in the sky. Air pollution problem resulted in the development of lung cancer and associated diseases in people. The gasoline car was one of the main factors that released carbon dioxide to the atmosphere‚ which lead to global warming. Facing the risk of devastation
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Ms. Haynes 2nd Period May 21‚ 2012 Electric Cars There is a big debate about the future of the auto industry. The new big topic is electric cars. Ads emphasize how much less pollution these cars put out‚ but the truth is that many people do not realize the downside of these cars. For instance‚ did you know that average battery cost for electric cars is between $18‚000 and $20‚000? Also‚ these cars produce significant more amounts of sulfur dioxide compared to traditional internal combustion
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