Technology Articles Technology Articles

One of the most important gadgets these days are the cell phones. Company executives are now required to have cell phones. So, it is important to be wise in purchasing the appropriate type of cell phone. There is a large network of services available in the country that it may help if you do some research and assess their offers before deciding on a cell phone plan.

Before you decide to buy a cell phone, you may want to decide first whether you want a prepaid cell service or a traditional cell phone plan. If you decide on a prepaid cell phone service, then no problem, no credit check, you just need to pay outright and immediately you have your phone. Some cell phone companies even offer free cellular phone unit when you acquire a prepaid cell phone service from them.

However, when you want a cell phone plan, you may need to choose from a by minute charging or by the second charging. Both charging process have positive and negative points. You need to assess your usage frequency and requirements before you decide on a cell phone plan.

You may research on the performance like if they have enough towers to reach you wherever you are. There are different cell phone plans for family and national use. There are also cell phone plans for regional use. All of these have their own benefits although there are also their disadvantages. For prepaid cell phone plans, there are cell phone units that may not have the capability for this connection.

There are cell phone plans like the family plans that are advantageous for family use and for those with small businesses. Also available is free access for emergency numbers. In addition, for family plans, it is cheaper to call the other cell phones included in one billing. Phone calls among family members are also discounted for this type of cell phone plan. National cell phone plans include free long distance charges. Another advantage is that you are not charged for roaming charges for this cell phone plan. For the regional use cell phone plan, you may be require to pay for long distance charges but airtime rates are lower.

Cell phone plans may be beneficial is you can acquire the once that have the benefits you need. The manner of usage is an essential requirement, if you do not need it as much and just for emergencies, prepaid cell phone plan could suit you well than traditional plans where you need to sign a contract with the service provider.

Prepaid cell phone plans are often preferred; however, for travelers the traditional plan with no roaming charges and no long-distance charges might be best.

All of this notwithstanding, in order to make full and effective use of your cell phone, you may want to set some guidelines in your usage. If you want your cell phone for your business, you may need to make sure you turn it off when you need privacy. Being available every time may not do well for you. Reserve sometime for yourself and never allow people to disturb you during this time. If your business partners know they could reach you even late at night and on weekends, they will be annoyed if you suddenly change this behavior. Having a cell phone and being available all the time may not be healthy, thus, you have to be wary not to allow people disturb you when you need to be alone with or without your cell phone.

This article will give you some tips on how to choose the best deal for cellular phones and even prepaid cell phone plan.

Posted under Electronics

A solar tower is a device that converts solar energy (heat from the sun) into electricity. Solar towers are suitable for large-scale power generation.

The Basic Component Parts of a Solar Tower Energy Plant

* Solar Tower - The solar tower is simply a large structure with a boiler (a tank used to heat liquids) at the top. The boiler collects the heat from the sun. It is also referred to as the “central tower” or “power tower”.

* Heliostats - These are movable mirrors that track the sun and reflect the sunlight at the top of the solar tower where the heat is collected. These mirrors move as the sun moves, so as to continuously reflect maximum sunlight toward the tower.

* Heat Transfer Fluid - We use the term “heat transfer fluid” because not all solar towers use the same. Early solar towers used water to collect the heat from the sun. Some solar towers use liquid sodium. Whichever liquid is used, it is referred to as “heat transfer fluid.”

* Heat Storage - Because we still want to generate energy at night after the sun is gone, newer solar towers have methods of storing heat so that it can be used during the night to continue generating electricity.

* Steam Generator - As stated earlier, liquid sodium is now used to collect the heat, and the liquid sodium is then used to generate steam.

* Steam Turbine - This is a generator that uses steam to generate electrical power. This is the same set-up as is used in a conventional power plant.

How Does a Solar Tower Work?

Computer controlled mirrors (called heliostats) follow the sun, adjusting their position as the sun moves, and reflect sunlight toward the top of the solar tower, where a heat collector tank is located. Of course, more than one heliostat is needed, so an arrangement of hundreds or even thousands of heliostats is used.

The combined reflected sunlight of these heliostats can produce temperatures as high as 550 degrees, Celsius at their focal point.

Thus, the liquid inside the boiler is rapidly heated and is then pumped downward into storage tanks, or is pumped directly into to a heat exchanger where it is used to make steam.

The steam produced by the heat exchanger is then led through a steam turbine, which uses the steam to generate electricity.

As an interesting note, liquid sodium can be used as a heat transfer/storage liquid, because of its ability to hold and store heat efficiently. Large storage tanks can be used to hold the heated liquid sodium. The stored “heat” can then be used at night, so as to continue generating steam which is used to generate electricity.

Currently, there are two solar towers in operation using the above design. The 64 MW Nevada Solar One and 11 MW PS10 solar power tower in Spain.

Solar tower energy is categorized as CSP (concentrated solar power) technology. There are several other power plant designs which use concentrated solar power technology. This includes the parabolic trough and the solar dish engine.

Learn more about Solar Power, Alternative Energy, and broad-scale solutions for Solar Power

Posted under Electronics

Solar energy consists of the light and heat emitted by the sun, in the form of electromagnetic radiation.

With today’s technology, we are able to capture this radiation and turn it into usable forms of solar energy - such as heating or electricity.

Although one could go into technical dissertations on the subject of electromagnetic radiation, how it is converted into solar energy, and the exact qualities of its electromagnetic rays, this is not something the average person needs or wants to know.

But in order to be able to benefit from the use of solar energy, there are a few facts you should know. Knowing these facts can assist you to make sound decisions, when looking at the use of solar power as a clean energy source for your home, RV, or whatever the case may be.

Environmental Facts about Solar Energy

All life on earth is dependent upon solar energy. In fact, without solar energy, there would be no life at all. Even the lowest life forms, such as plankton and microbes, need solar energy (in the form of sunlight) in order to survive.

Solar energy is completely environmental friendly, producing absolutely no carbon emissions or other harmful byproducts whatsoever.

Solar energy can be used successfully and cost-effectively just about anywhere on the planet. You do not need to live in a tropical or desert climate in order to benefit from the use of solar energy. Solar power has been used successfully in many cold climates and even in the polar regions.

Every area of the United States of America receives enough sunlight to benefit from and make use of solar energy and solar technology.

The cheapest and most effective method of utilizing solar energy in your home is currently the use of solar water heating systems. In fact, for over one hundred years, solar water heating systems have been commercially available in the United States.

Solar energy can be used for heating homes effectively in cold climates, as well as in warm climates. In fact, solar heating has been in use many cold-climate northern European countries for several decades now.

Solar energy technology has advanced to the point where it can be now be a viable and cost-effective replacement for regular grid-electricity.

Solar energy is rapidly increasing in popularity - so much so that the demand for solar-powered gadgets is currently greater than the supply.

Facts about Solar Energy Usage

Solar energy can be used to provide electricity, heating and hot water for homes.

Solar energy can also be used to heat swimming pools. In fact, many pools in Scandinavia and Europe are heated with solar energy.

Solar Energy can be used to power vehicles, such as solar powered cars, and even a solar powered airplanes. NASA has successfully designed, built, and tested an airplane which is powered wholly by solar energy.

A few examples are: solar battery chargers, solar radios, solar flashlights, solar calculators, solar-powered attic fans, solar-powered backpacks (which recharge batteries for small devices), hybrid solar chargers (for cell phones, satellite phones, MP3 players, GPS devices, cameras, and more), solar-powered garden lights … and much, much more.

by Anna

For further information and explanations about solar energy and how you can use it to save money and protect the environment, please visit Important Facts about Solar Energy, Solar Battery Chargers, and Solar Power.

Posted under Electronics