A renewable energy source is energy available from natural resources such as sunlight, wind and tides, which are renewable or naturally replenished. As distinct from fossil fuels, which take millions of years to develop, sunlight, wind, rain and water are natural resources available in abundance.

Many people consider the use of solar energy, the widely known clean energy is of recent origin. However, the solar panels were utilized to generate electricity in the 1920s to heat water instead of using costly conventional electrical heating systems.

Renewable Energy from Past to Present

When fossil-fuels were discovered, the use of solar energy was discontinued giving way to the more affordable and dependable fossil-fuels at that time. However, these petroleum products had an adverse effect on the environment causing pollution due to emission of harmful gases and added to that their levels also started depleting.

These factors contributed to the resurrection of renewable energy resources. Currently, solar power plants, wind farms and solar thermal plants are extensively utilized to provide energy to the whole towns and cities. The population using alternative sources of energy has cropped up all over the world with Canada taking the lead as the first country to take pride in having an entire community utilizing only solar power.

Apart from this, the technology is rapidly changing and with that the term, ‘renewable energy’ is being redefined.

The Future of Renewable Energy

Renewable energy is generated when natural resources such as wind, water and sunlight are harnessed though propulsion. However, the movements of humans are also being regarded as clean energy resources. For example, New Energy Technologies is at present carrying out tests to generate kinetic energy from ‘speed bumps’.

The ‘bumps’ are in fact a reverse of the classic ‘motion inhibitors’. These flat panels dip a little into the ground when a car passes over it. The difference in height between the road and the dropped panel causes the bumps.

Under the panel, 2000 watts of instantaneous energy is generated for every car that passes over the speed bump. With 1000 cars passing over the speed bump every day, 2,000,000 watts or 2,000 kilowatts of electric power is generated every day.

During the course of a month, this figure touches 60,000 kilowatts. This is sufficient electric power to cater to 60 homes on an average for the whole month.

This method of generating kinetic energy is not restricted to speed bumps alone. Israel is testing the roadways that generate small amounts of electricity as cars pass over the specific roadway surface. The amount of energy generated is only 400 kilowatts per kilometer (0.6 mile). Although this does not appear to be a significant amount of energy, if the whole of the interstate system of the US were to be utilized to generate kinetic energy, the 75,000 km stretch of the roadways generate 30,000,000 kilowatt of energy.

This undoubtedly is another unique definition of renewable energy. The new concept of treating kinetic energy as a renewable energy is gaining ground all over the world, with Tokyo is installing flooring that harvests power from the visitors who visit subways daily.

Dance clubs are making use of the energy generated from the movements on the floor to produce electricity. Even asphalt is being regarded as the major material for garnering thermal energy in desert climates when roadways can reach very scorching temperatures. There are plenty of sources for supplying new and unique renewable energy solutions to assist us in the transitional phase to shift to more long-lasting and environmentally friendly energy sources.

Even at present, there are numerous new technologies that can facilitate heating the houses, recharge our batteries and illuminate the entire backyard using ‘green’ energy sources.

Solar energy technology is an old concept and was developed years ago, it has capability to meet all your energy needs without being dependent on the grid for your power needs. You may be wondering how can you enjoy watching big screen television, using multiple refrigerators or even enjoy cool breeze of air conditioners in those hot months.

All this can be met using solar power to your advantage as the technology has further developed. Getting off the grid has become a reality these days especially for residential or commercial buildings. These days most of the solar panel technology has become quite efficient and affordable that you can easily install it for your homes.

This is also a fact that that the initial investment could be very high as compared to the conventional power. With the rising prices of fuel and utility, solar energy is now the only viable solution to meet your power demands.

Many new buildings constructed these days have the solar panel array on the roof tops which look good as compared to large solar panels in the past. The solar panels these days are not only more efficient but are small in size so that less space is required to install the solar power system. Today you will find Photovoltaic (PV) solar panels more attractive and modern, thanks to the development of technology.

Generating electricity using solar panels is really a new concept, many houses which have solar panels installed are also connected to grid, this ensures drastic cut in their energy bills as they are using mixture of both solar power and conventional power. There are some houses which in fact produce surplus power using PV panels and earn handsome money by selling this power to the utility companies.

Installing solar array is not that costly as most people think, there is subsidy and incentives offered by the federal and local governments to the people who are interested to install the solar panels. There are almost ten federal incentives which you can expect when you install the solar panels. These are in the form of tax credits, corporate and private exemptions and special loans and grants.

In addition you can also get local solar rebate, property tax incentives and much more. In some of the states 70% of the costs are borne making installation much easier for the common home owner.

Solar Panels for Homes

Solar panels or Photovoltaic system convert sunlight into electrical energy, each solar panel contains about a group of 30 to 40 solar cells which are made of silicon or some other material which absorbs sunlight. The material is so efficient in absorbing light that it immediately converts the solar power into electricity.

Each solar panel is a series of solar cells which are connected all together; the entire panel is sealed to save it from the moisture. The part of the solar cell which absorbs the electricity is negative and the bottom is considered to be positive.

When the sunlight is absorbed into silicon cells, electrons are knocked loose and travel from negative to positive layer and the electrical energy is passed through the contacts in the top layer and is routed through the circuit array thus producing power.

A cordless power drill is an electric drill, which utilizes rechargeable batteries for all drilling jobs. These drills have similar features of AC mains-power drills. They are available in the hammer drill pattern and most of them have a clutch. There are also right angle drills, which permit a worker to drive screws in a narrow space.

The most popular types of batteries used in power drills are nickel-cadmium (Ni-cad) batteries and lithium-ion batteries, with each holding half the market share. While Ni-cad batteries have been in use for quite some time and are less expensive, they have more disadvantages compared to lithium-ion batteries.

The disadvantages of Ni-cad batteries are limited life, self-discharging, and ecological problems on disposal. On the other hand, lithium-ion batteries are getting more popular these days in view of their short charging time, longer life and low weight.

Lithium-ion batteries weigh just half that of nickel-cadmium batteries For example, if someone holds a 18volt lithium- ion battery powered cordless drill and a 18 volt Ni-cad battery powered cordless drill one in each hand, he will immediately observe a major difference in weight, with Li-ion battery powered cordless drill being much lighter.

The power output remains constant until the battery gets drained out; it is this feature that nickel-cadmium batteries lack. For example, instead of charging a tool for 15 minutes of use, 15 minutes of charge can run the tool for an hour. This makes the tool more adaptable.

Lithium-ion batteries also retain a charge for considerably longer time than the nickel-cadmium batteries, the charge lasting as much as one year. When comparing two cordless power drills, one should compare drills with similar power.

While a 12volt Ni-cad battery has the same power as a 12 volt Li-ion battery. However, one cannot expect the same torque seen in an 18volt Ni-cad battery powered cordless drill as in a new 12 volt Li-ion cordless driver.

Cordless power drills are known these days as “drill drivers” instead cordless drills. The clutch equipped in cordless drill driver regulates the amount of torque exerted.

When the preset resistance has been attained, it separates the drill’s drive shaft producing a clicking sound. The correct setting of the clutch is important as it helps in driving the screw correctly into the layers without damaging them, besides not stripping the screws. While comparing different cordless power drills, it is also essential to verify the number of clutch settings each drill driver has.

When comparing different cordless power drills or drill drivers, one will observe that most of them have key-less chucks. They are firmly tightened manually so that no chuck is loose. Key-less chucks are normally 3/8 inch or ½ inch.

There are also small cordless drills having key-less chucks that take only quick connect bits. The most essential aspect one should consider when buying a cordless power drill is how one feels holding the power drill driver in the hand. Is it very heavy to hold? Is it too heavy to work overhead?

Whether can one hold it straight without tipping up or down? In other words, the type of battery used in a cordless power drill determines its quality, versatility and durability.