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Вопрос № 237556 - Английский язык

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Why are solar cells chosen to provide power for most space installations?
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  • Solar cells provide power for most space installations because other electric power sources are prohibitively expensive to install.
  • Solar cells provide power for most space installations because they have no moving parts that need service or fuels that require refilling.
  • Since solar cells are able to utilize artificial light, they are the best choice as a power source for space installations.
  • Solar cells are chosen to provide power for most space installations, because they are the safest way to produce energy.
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Вопрос задал(а): Анонимный пользователь, 10 Ноябрь 2020 в 00:25
На вопрос ответил(а): Анастасия Степанова, 10 Ноябрь 2020 в 00:25

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Вопрос № 1058581

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Solar energy
1. Solar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of different technologies. Solar radiation, along with secondary solar-powered resources such as wind and wave power, hydroelectricity and biomass, account for most of the available renewable energy on the Earth. Only a minuscule fraction of the available solar energy is used.
2. Solar powered electrical generation relies on heat engines and photovoltaics. Solar energy's uses are limited only by human ingenuity. A partial list of solar applications includes space heating and cooling through solar architecture, potable water via distillation and disinfection, daylighting, high temperature process heat for industrial purposes. To harvest the solar energy, the most common way is to use solar panels.
3. Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute solar energy. Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.
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What is the difference of solar technologies?
Solar radiation and secondary solar-powered resources are renewable energy on the Earth.
Solar technologies are broadly characterized as either passive or active ones.
To harvest the solar energy, the most common way is to use solar panels.
Solar technologies are differentiated by the way they capture, convert and distribute solar energy.

Вопрос № 1072530

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Cars have always caused air pollution. In the past, there was a lot more air pollution created by cars than there is today. In the future, there will probably be even less. Two good ways for pursuing the dream of less air pollution are cars that run on solar energy and cars that run on fuel cells. Solar energy and fuel cells don’t cause pollution because they do not give off any exhaust.
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What is a good way for pursuing the dream of less air pollution?
A good way for pursuing the dream of less air pollution is cars that run on water.
A good way for pursuing the dream of less air pollution is cars that run on petrol.
A good way for pursuing the dream of less air pollution is cars that run on solar fuel.
A good way for pursuing the dream of less air pollution is cars that run on solar energy and on fuel cells.

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Вопрос № 237557

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How does a break-a-beam sensor operate?
A break-a-beam sensor is used to provide light-sensing capabilities.
When a safety condition is breached, a break-a-beam sensor prevents valves or electrical switches from working.
A break-a-beam sensor transmits a signal when personnel come into a specific area.
A break-a-beam sensor sends out a signal when a beam of light is interrupted.

Вопрос № 237558

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What is the function of a monitoring instrument in a calibration?
This instrument is used to ensure ethical practices within the market.
This instrument is used to define and agree upon national and international standards.
This instrument allows the calibrator to know every factor that may affect the calibration.
This instrument allows the calibrator to compare the measured behavior with the standard at which the device should be.

Вопрос № 237559

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What are thermostats used for?
Thermostats provide a voltage generation required for continuous temperature monitoring.
Thermostats are used to exhibit changes in resistance with changes in temperature.
Thermostats provide a means for connecting temperature sensors and extension wires.
Thermostats are used to keep the temperature at the desired level.

Вопрос № 237560

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How do point level sensing devices work?
Point level sensors give output of a continuous reading of level.
Point level sensors measure level within a specified range.
Level sensors of this type are always based on differential pressure technology.
They mark a specific level, which is commonly used as switch or high alarm.
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