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发布时间：2022-01-07
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Power Conversion Efficiency=Optical output power / Electric input power
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更多“Power Conversion Efficiency=Optical output power / Electric input power”相关的问题
第1题
Fill in the blank with one of the words given below. Change the form where necessary. intu
itive conversion hazard duration feasible distinction alternative cue eligible incentive Solar power is the ___________ of the sun’s energy into heat and electricity.
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第2题
TEG（Thermo Electric Generator）热电偶发电装置：热能直接转换为电能的发电。Thermocouple power plant: the generation of electricity by direct conversion of thermal energy into electrical energy.
第3题
According to Sir Nicholas Serota, what is part of a "sea change" in culture？A．The visual a
According to Sir Nicholas Serota, what is part of a "sea change" in culture？
A．The visual arts growing to be the hottest creative medium.
B．The success of London"s Tate Museum.
C．A conversion of a disused power station into a modern gallery.
D．The Tate Modern"s impact on the local economy.
第4题
The earliest vertical windmills were used in Persia more than 2,000 years ago for the grin
ding of grain. Windmills were adopted for pumping water in North America by the middle of the nineteenth century. Their use declined drastically in the 1930's when inexpensive electricity reached the rural areas. A renewed interest in the use of wind power to generate electricity followed the energy crisis of the 1970's. A program of the United States Department of Energy encouraged the development of new machines, the construction of wind farms, and an evaluation of the economic effect of a large scale Use of wind power.
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Public acceptance of wind energy conversion systems is an important consideration in planning for the widespread application of wind energy. Studies have shown that the environmental impact of such systems is relatively small compared with conventional electric power systems. Wind-powered systems do not require the flooding of large land areas or the alteration of the natural ecology, as dohydroelectric systems. Furthermore; they produce no waste products or thermal or chemical effluents, as fossil-fueled and nuclear fueled systems do.
Which of the following is NOT an advantage of wind energy？
A．Wind energy does not require the flooding of large land areas.
B．Wind energy produces no waste products.
C．The availability of wind energy is not dependent on the weather.
D．Wind energy does not produce thermal or chemical effluents.
第5题
The exploitation of the power in the Sun's rays is a form. of alternative energy now showi
ng new commercial promise.
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In the US, manufacturers have made important 【C1】______ in the development of the technology to bring down the cost of solar conversion systems 【C2】______ improving their reliability.
The direct conversion of solar 【C3】______ electrical energy, using photovoltaic cells 【C4】______ distinct advantages as an alternative energy option.
【C5】______ other forms of renewable energy, photovoltaic is based on modular solid state devices which can be mass 【C6】______ at a relatively low cost.
Here wafers of silicon—not dissimilar 【C7】______ ones which are turned into silicon chips— 【C8】______ an electric current when light falls upon them.
When built into panels or modules where each cell interconnects, the amount of electricity generated can be large enough to 【C9】______ a home or even a community.
Over the past 10 years, 【C10】______ extensive research and substantial Government and private industry funding, the price of photovoltaic modules has dropped 【C11】______ .
【C12】______ in 1973-74 the price per peak watt was between US $100 and $150, commercial prices for small array system now vary between $6.50 and $7 per watt.
This rapid price reduction has been accompanied by a 400 per cent jump in the 【C13】______ efficiency of photovoltaic modules.
【C14】______ solar cells are poor converters of sunlight to electricity. Early cells could only manage to mm about five per cent of the incident rays into electricity, but recent development have increased 【C15】______ to more than 10 percent.
【C1】
A．strides
B．background
C．investments
D．strategy
第7题
某功率的测量结果为5.778W，其扩展不确定度为0.24W（置信概率为95%)，有效自由度为10，则该功率的
某功率的测量结果为5.778W，其扩展不确定度为0.24W(置信概率为95%)，有效自由度为10，则该功率的完整测量结果为()。
(A)P=5.778W,U95=0.24W,νeff=10
(B)P=5.778W,U95=0.3W,νeff=10
(C)P=5.78W,U95=0.24W,νeff=10
(D)P=5.8W,U95=0.2W,νeff=10
第8题
You take out a loan at an annual percentage rate （APR) of 14.02% with daily compounding. If the annual inflation rate is 10%, then the real effective annual rate （EFF) on you loan should be
A、
B、
C、
D、None of the above
第9题
第一篇 Putting Plants to Work Using the power of the sun is nothing new. People
第一篇 Putting Plants to Work
Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels(太阳能电池板) for decades. But plants are the real experts. They’ve been using sunlight as an energy source for billions of years.
Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide(二氧化碳), and water into sugars and starches(淀粉), stored energy that the plants can use. This conversion process is called
photosynthesis(光合作用). Unfortunately, unless you’re a plant, it’s difficult and expensive to convert sunlight into storable energy. That’s why scientists are taking a closer look at exactly how plants do it.
Some scientists are trying to get plants or biological cells that act like plants, to work as very small photosynthesis power stations. For example, Maria Ghirardi of the National Renewable Energy Laboratory in Golden. Colo., is working with green algae(水藻). She’s trying to trick them into producing hydrogen instead of sugars when they perform. photosynthesis. Once the researchers can get the algae working efficiently the hydrogen that they produce could be used to power fuel cells in cars or to generate electricity.
The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthesis, plants normally make sugars or starches. “But under certain conditions, a lot of algae are able to use the sunlight energy not to store starch, but to make hydrogen.” Ghirardi says. For example, algae will produce hydrogen in an airfree environment. It’s the oxygen in the air that prevents algae from making hydrogen most of the time.
Working in an airfree environment, however, is difficult. It’s not a practical way to produce cheap energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate(硫酸盐) from the environment that the algae grow in, they will make hydrogen instead of sugars, even when air is present.
Unfortunately, removing the sulfate also makes the algae's cells work very slowly, and not much hydrogen is produced. Still, the researchers see this as a first step in their goal to produce hydrogen efficiently from algae. With more work, they may be able to speed the cells’ activity and produce larger quantities of hydrogen.
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to get and to feed, Ghirardi says, and they can grow almost anywhere: “You can grow them in a reactor, in a pond. You can grow them in the ocean. There’s a lot of flexibility in how you can use these organisms.”
31 How do plants relate to solar energy？
A They have been using it for billions of years.
B They are the real experts in producing it.
C They have been a source of it.
D They have been used to produce it.
第10题
假设挂牌年利率（Annual Percentage Rate, APR）为12%，那么，每月复利计息一次对应的有效年利率（Effective Annual Rate, EFF)为（）
A、
B、12%
C、
D、无法确定
