首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Widespread adoption of plug-in electric vehicles could dramatically cut greenhouse gas pollution and reduce U.S. dependence on f
Widespread adoption of plug-in electric vehicles could dramatically cut greenhouse gas pollution and reduce U.S. dependence on f
admin
2014-05-30
78
问题
Widespread adoption of plug-in electric vehicles could dramatically cut greenhouse gas pollution and reduce U.S. dependence on foreign oil. But results of an electric-car pilot project presented recently at the annual meeting of the American Association for the Advancement of Science provide added incentive to go electric: Car owners could return unused electricity back to the grid(输电网)and make real money while doing it.
Electric cars need big, powerful batteries to accelerate to highway speeds and travel scores or even several hundred kilometers on a single charge. But because most drivers drive just a few dozen kilometers a day, most of that battery capacity sits unused. To take advantage of that storage capacity, Willett Kempton, director of the University of Delaware’s Center for Carbon-Free Power Integration in Lewes, teamed up with an electric car maker, several utilities, a software company, and PJM Interconnection, one of 10 regional organizations that coordinate and control the U.S. electrical grid.
To ensure that electricity flows steadily and without interruption, the U.S. government requires PJM Interconnection and its counterparts to have reserves of power in case a generator goes down and other electrical reserves to maintain the 60-Hz frequency of alternating current that our appliances and devices are accustomed to dealing with. Today, PJM Interconnection and its counterparts pay conventional power plants to maintain this reserve power. But as renewable energy sources such as wind and solar, which provide energy cleanly but intermittently, come online, these grid operators need to increase their storage capacity to ensure a steady electricity supply. So Kempton and his colleagues set out to provide some of the backup power from a fleet of parked electric cars.
Kempton’s team used an electric car from AC Propulsions, a California car company, which was custom-built to provide electricity back to the grid. They used commercially available software and hardware that companies such as PJM Interconnection use to monitor and control energy flow. In November, the company hooked the grid up to the car, and Kempton’s team’s electric car became the first car in the world to earn its keep as a backup electric power source. At the rates that PJM Interconnection pays today to maintain power reserves, a hooked-in electric car could generate $1,800 a year for its owner.
"I think it’s tremendously exciting," says Kathryn Clay, director of research for the Alliance of Automobile Manufacturers. "The extra dollars an electric car provides will not be enough by themselves to get consumers to adopt grid-enabled vehicles—for that we also need better and less expensive batteries and tax incentives to give the market an encouragement" Nevertheless, "it’s an incentive to push in the right direction."
What is true about renewable energy sources such as wind and solar?
选项
A、They reduce the dependence on backup power.
B、They increase the necessity for backup power.
C、They are the main sources of backup power.
D、They are regarded as the best back power.
答案
B
解析
原文该句开头的as...表明本句中存在着一对因果关系,原文表明:因为使用了不稳定的可再生能源,导致对后备电力有了更高的需求,因此,本题应选B。
转载请注明原文地址:https://www.kaotiyun.com/show/Xe17777K
0
大学英语六级
相关试题推荐
Graduationspeechesareabitlikeweddingtoasts.Afewarememorable.Theresttendtotriggersuchthoughtsas,"WhydidIwe
A、Hecan’tcatchupwithhisclassmates.B、HefindstheEnglishcourseloadtooheavy.C、Heisnotinterestedinhispresentmaj
A、They’rewillingtotakerisks.B、Theyhavelong-termfinancialplans.C、Theyseldomgooninstinct.D、Theybuyfewstocks.A男士
A、Makeacalltoherbrother.B、Buyabookforherbrother.C、Checkoutthelist.D、Askthemanaquestion.A女士想给弟弟买几本书,却又不知道买什么
A、Tofindakindofgoodjoggingshoes.B、Torunaroundthetown.C、Totryanotherwaytobuytheshoes.D、Toordersomecatalog
Withgraduateunemploymentatitshighestformorethanadecade,thelureoftheparentalnesthasneverbeenstronger.Butspo
A、Thereisstillalongwaytogobeforemancancontrolnaturaldisasters.B、Internationalcooperationcanminimizethedestruc
A、Ithappenedinthenight.B、Therewasnosurvivor.C、Alorrycollidedwithacoach.D、Thecollisionwascausedbyfog.C第1则新闻提
TheamountoffloatingplastictrappedinanorthAtlanticcurrentsystemhasn’tgotanybiggerin22years,despitemoreandmo
A、Administrativenews.B、Generalsocialconcerns.C、Financialnews.D、Localnews.C男士说,他喜欢写文章,并且想根据自己所知的商业知识撰写金融新闻。选C。
随机试题
从重从快惩处严重刑事犯罪分子的前提是()。
从东南亚入境一男子,3天前因突然剧烈呕吐,腹泻而入院,腹泻呈米泔水样,便检发现穿梭状运动的细菌,请问致病菌可能是()
∫ex(cosex)dx
下列关于大鼠抓法的叙述,错误的是
案情:2012年11月,甲因为严重肠炎到乙医院进行手术,手术很顺利,伤口也愈合得很快。但出院后,却时常感觉到腹内疼痛。2013年6月,经另外一家医院诊治,其腹腔内尚留有手术用的纱布。甲认为,从2012年11月至今,自己未在任何医院进行过手术。所以这块手术纱
以下关于物权保护采取方式的表述错误的是()。
用友报表系统中,数值单元的内容只能通过计算公式生成。()
()科目编码必须按财政部的统一编码方案进行编制。
为了保证数据库系统稳定运行,需要使用服务器容错技术保证其运行服务器的可靠性。下列有关Active-Standby模式服务器容错技术的说法,错误的是()。
Whattimeistheman’sflight?Whatisthereductioninthecompany’sexports?
最新回复
(
0
)