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Transcript of Solar Energy
How do solar panels work?
Why are solar panels important?
Solar Panels are important because they give us the energy to run our machines.Solar panels can be found in all different shapes and sizes including round, square, and rectangle. You can see them on top of buildings and houses or standing alone in fields. Solar panels are in hand held devices and they are in energy efficient appliances. The sun is a wonderful natural resource and can greatly cater to our way of life.
Solar cells are devices that convert light energy directly into electrical energy. In these cells, there are semiconductors (silicon alloys and other materials). You may have seen small solar cells on calculators or some mobile phones. Larger arrays of solar cells are used to power road signs, and even larger arrays are used to power satellites in orbit around Earth. Solar cells are also called photovoltaic cells or PV devices
What's solar energy?
Solar energy is energy obtained from sunlight.Solar energy has been used by humans for a long time for uses such as heating, cooking food, drying clothes...
Nowadays it is also used to create electricity.
As technology has improved, solar power costs have decreased and it has become a more viable alternative, competing with energy sources such as coal and oil.
While solar power is becoming more efficient, it only provides a small fraction of the world's energy supply.
Solar panels are different to solar cells. Solar panels do not generate electricity directly. Instead they heat up water directly. A pump pushes cold water from a storage tank through pipes in the solar panel. The water is heated by heat energy from the Sun and returns to the tank. They are often located on the roofs of buildings where they can receive the most sunlight
Depending on the location and design of your system, the typical home installation ranges from 3 to 7 kilowatts and costs between $18,000 to $40,000 to purchase. It is really expensive!
Who invented solar panels?
Pros and Cons
Solar panels give off no pollution. The only pollution produced as a result of solar panels is the manufacturing of these devices in factories, transportation of the goods, and installation.
The major con of solar energy is the cost of solar cells.
One of the great pros of solar energy is the ability to harness electricity in remote locations that are not linked to a national grid. A prime example of this is in space, where satellites are powered by high efficiency solar cells.
Why do we need it?How does it lead to a better health?
Solar power is source of clean energy.
It doesn't produce pollution or greenhouse gases or carbon compounds.
Solar power would be a lot safer for the environment and a lot better for the health of people.
how much energy the sun gives off in a given day?
The total energy from the Sun that hits Earth is 2,787,020,730,988,480,000 watts.
Most of the Sun’s light is radiated in a direction that does not send it to Earth.
Only 0.000000724654% of it reaches the Earth.
That’s 7.24654 billionths of the Sun’s total light.
The Sunlight that reaches Earth is equal to approximately 1,370 watts per square meter.when the sun is at zenith. Because of the atmosphere, the amount of energy that reaches the ground is about 1,000 watts per meter, when the sun is directly above and no clouds obscure. (One watt is equal to 1 joule (J) of energy per second.)
Things using solar power
Solar powered compacting trash can
Solar spark lighter
(the solar car doesn´t actually exist, it is just a prototype)
How the sun makes energy
The sun makes energy by turning hydrogen gas into helium. As it does so, it release energy which escapes outwards into space. This process is called
Clouds stop some of the Sun´s energy from reaching the Earth, but not enough gets through for our needs
-The first practical solar cell was created by Bell Laboratories in 1954. It only produced 1 Watt of energy and cost $250 for that 1 Watt.
-If you covered 10,000 square miles of land in the American Southwest, it would generate enough power to meet the energy needs of the entire United States. Although this seems like a lot of land, the US has strip-mined an equivalent amount for coal.
-Half of the solar panels produced worldwide are consumed by Japan in their residential sector.
-Just like the rest of life on earth is controlled by the sun, wind is caused by radiant heating and cooling. In theory, this makes wind energy the perfect complement to solar.
-Fossil fuels are simply a form of stored solar energy.
-Albert Einstein earned a Nobel Prize in physics for explaining photovoltaic effect (creation of electricity from the sun’s rays).
-The largest solar electric plant in the world is located in Germany, who has half the solar resource of the United States.
The history of solar energy
The energy of the sun has been used by people for a long time. Over 3000 years ago a king's palace in turkey was warmed from water heated by sun. The first place for collecting the Sun's energy, or solar furnace, was built in France in 1714.
In 1878, a solar steam engine was used to drive a printing press in Paris.
One problem with using solar energy is that the Sun does not shine for that same length of time all over the world. Also, that the scientists do not yet know the best way of
trapping the energy of the Sun.
The first solar panels were invented by a man named Russel Ohl.He invented the silicon solar cell in 1941.Even though Russel invented the first silicon solar cell , the first solar technology was invented in 1839 by a man called Edmund Becquerel.Later on in 1954, the three American researchers Gerald Pearson, Calvin Fuller and Daryl Chapin were able to create a solar panel that had the efficiency level of 6% with direct sunlight.
The costs of solar panels