HDTV Reviews
Don’t you think it is good idea to get a new television for Xmas or New Year season? Firt, you may want to check out some gadget review sites before you buy a new television. Though the older CTR (Cathode Ray Tube) display TVs are still available in the market, the latest Liquid Crystal Display (LCD) and Plasma TVs are gaining high popularity. As a matter of fact, televisions with High Def video and surround sound features are incredibly popular in the market. If your wallet allows it is wise to buy a LCD or Plasma High Def television, since that is clearly the future trend. I am sure you don’t want to be left out in the dark when all your friends and neighbors are enjoying the crystal clear pictures on high definition televisions.

Where to look for reviews?
You can find number of websites with TV reviews online. A quick search got me this straight forward advice on buying a new TV for the Christmas season.
“The holidays around the corner and most of you must be preparing for the Christmas. Though the economy is down when it comes to celebrate Christmas everyone are happy to spend money. This year some of the readers of The Tech Post decided to get new HDTV and asked for the LCD HDTV reviews. Few of them wanted to buy the TV as a Christmas gift for their loved ones while others wants to purchase a HDTV to watch all the Christmas celebrations in style. We have checked various sources both online and offline to find out honest opinion about HDTV models available in market. While it is impossible to test and review the full features of the all the LCD and Plasma TVs available in the market, we have found that Samsung LN52A650 is the best selling model with highest rating.”
Read the full article at LCD TV selection.

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The term “photo” derives from the Greek word for “light,” and the term “voltaic” comes from the word “volt” which means “electrical force.” A “cell” is a small receptacle or container containing electrodes which generate power.

Thus, a photovoltaic cell is a container that creates electric force, through light.

Whereas a solar cell can generate electricity from any light source, its intended use is the collection of solar energy from the sun.

How a Solar Cell Works

The solar cell works as follows:

Photons (which are particles of light in sun rays) hit the surface of the solar cell and are absorbed a semiconductor, such as silicon.

These photons (bits of sunlight) knock electrons loose from the atoms inside the semiconductor. The photons then push the electrons along, leaving a “gap” in the atom. Another electron is then pulled from an adjacent atom to fill the gap. And so an electrical flow is generated.

The simplicity of this is that one atom has an extra electron, and the other atom is missing one. This is referred to as a “difference in potential.” Nature, wanting to remain balanced, tries to even things out by pulling another electron from the neighboring atom.

A solar panel is comprised of a group of solar cells which are linked together to produce the desired amount of electrical energy.

A group of solar cells linked together can also be referred to as a “module.” Thus the terms “solar panel,” and “solar module,” are synonymous to each other. Essentially, they mean the exact same thing. “Solar panel” is the more common term, and “solar module” is the technical term.

One can use solar panels individually or one can link several together in order to generate more electricity. When a group of solar panels are linked together, it is called a “solar array”. The more solar panels are contained in a solar array, the more power they produce.

Solar Power is a clean and virtually unlimited source of energy. I say “virtually unlimited” because the sun itself won’t last forever. But we won’t have to worry about that for the next few billion years.

Since solar power is a clean energy source which has been around for decades, one might wonder why its not used more. The answer to this lies partially in the cost of producing solar panels, as well as in the efficiency of the solar panels.

We are currently in the second generation of solar panel technology and verging on the third. A lot has changed since the first generation. Solar panels a are becoming a viable source of clean energy.

The solar cells of earlier times were relatively large and bulky compared to our current models. In view of the amount of energy and material required to produce them, and the amount of energy they actually produced, using solar energy was more costly than using fossil fuels. The only exception was in places where little or no fossil fuels were available, such as in space.

With the second-generation solar cells, we attempted to tackle this exact problem. We attempted improve manufacturing techniques so as to reduce the costs, materials and energy needed for the production of solar cells.

Recently, major advances have been made in the production of solar cells. These advances have reduced production costs.

One contribution made to area was the development of techniques to coat glass or ceramic materials with very thin layers of semi-conductive substances. This made it possible to produce solar panels using only a fraction of the semi-conductive material that was required earlier. The production of solar panels using this second-generation technology is referred to as “Thin Film Technology.” (See Thin Film Solar Technology for more information.)

Third-generation solar energy technologies are currently being researched and developed. The objective is to improve the power of solar cells even further (while keeping production costs to a minimum) in which case thirty to sixty percent of the sunlight hitting the panels will be converted into electricity. (Currently, solar panels convert only about twenty percent.)

But regardless of third generation solar technology, the second-generation solar cell is efficient enough to make solar technology viable - and a host of new solar-powered products have hit the consumer market.

Solar-powered calculators have been in use for a while now, we’ve all seen them. We have even seen a few other novelty devices hit the market. But its only in the last few years that solar devices have come into serious and practical use.

The last two years in particular have seen a virtual explosion of solar devices hitting the market. Solar flashlights (I’ve often wandered what use they were), solar-powered radios, and, recently, solar battery chargers.

One can also now find a wide range of portable solar chargers and Solar Panels, which are lightweight and easy to transport, yet capable of providing a decent amount of power in even the most remote locations. Solar chargers are becoming a standard part of wilderness survival kits and emergency preparedness kits.

All of this is a result of the developments in solar cell technology, and the coming of the Solar Age.

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Visit Facts about Solar Energy to learn more about solar power.

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