The technology is more than just cool. In our car-filled world, plug-in vehicles could reduce the amount of gas we use, which keeps rising in cost now and then. Besides, driving around in these vehicles may even help the environment. Gas-burning cars produce a lot of greenhouse gas, which causes global warming.
The first company-produced plug-in vehicles could hit the roads by 2020. But engineers still have a lot of work to do to make the technology practical and inexpensive.
Batteries are the biggest challenge. In the plug-in-vehicle world,Li-ion(锂离子)batteries are getting the most attentionThese batteries can store a large amount of energy in a small package, and they last a longer time between charges. Li-ion batteries can fit laptops, cell phones, heart instruments and other similar pocket ones.
But because cars are so big and heavy, it would still require a suitcase-sized Li-ion batteries to power about 12km of driving. What's more, the batteries are much expensive.
“A car filled with batteries could go a long distance,” says Ted Bohn, an electrical engineer in Chicago. “But it couldn't pull any people, and it would cost $100,000.” So researchers need to work out how to make batteries smaller and cheaper, among other questions.
“The answers don't exist yet, ” Bohn says, “As a kid, I thought someone someplace knows the answer to everything. All of these questions haven't been decided. That's what engineering is about-making a guess, running tests and getting fine results.”
【辽宁省实验中学分校2016-2017学年高一6月月考英语试卷】相关文章:
★ 江西省赣州市兴国县将军中学2017-2013学年高一下学期期中考试(兴国班)英语试题 Word版无答案
★ 辽宁省实验中学分校2017-2017学年高一上学期期中考试英语试题
★ 湖北省武穴中学2017-2017学年高一10月月考英语试题
★ 辽宁省六校协作体2017-2018学年高二期初考试英语试卷
★ 浙江省平阳中学2016-2017学年高一12月月考英语试题
★ 河北省保定市高阳中学2017-2017学年高一上学期第十一次周练英语试题
★ 广西钦州市钦州港区2016-2017学年高一12月月考英语试卷
★ 江西省弋阳县第一中学2016-2017学年高一12月月考英语试题
★ 安徽省泗县双语中学2016-2017学年高一12月月考英语试题
★ 河南省实验中学2017-2017学年高一上学期期中考试英语试题
最新
2019-11-15
2019-11-15
2019-11-14
2019-11-14
2019-11-11
2019-11-11