Why Do We Need Alternative Energy Sources

No doubt the natural energy resources are not eternal nor infinite. Greed has led us to think about alternative sources of energy, primarily, are clean, that is, to not add more pollution to our atmosphere punished - and we have done too much damage. A clear example of an inexhaustible source of energy is sunlight. Given that we will be able to have it for as long as we want (although one day be exhausted), humans have decided to dip into this free and abundant resource where you look and study.

Alternative energy sources 

Solar

What do we need to build a solar power system? In reality, few things. Naturally, the solar panel and a power converter capable of transforming the power delivered by the panel mentioned in the alternating current commonly used in our home. Most panels that are on the market and which are accessible to common public deliver a voltage of 12 Volts and its cost varies according to the power that is able to deliver.

Manipulation of several panels can mean a sum of power and can make connections in series (12V + 12V = 24 V) or in parallel for 12V with current twice. The choice is ours depending on the converter (known as inverter) and it needs to deliver its output to the desired voltage to run our appliances.

But as the sun is not fully on our home 24 hours a day, we have a storage system unused energy during the day (or over that produced by the solar panel). Said support element is one or more batteries, depending on the size of the development. So if we add batteries to the system, we must necessarily seek adequate charge to keep them always ready and willing to work during the time when the panels reach not supplying power to demand our consumption. This is during the night and cloudy or rainy days.

Wind power

It is the energy from wind, i.e. the kinetic energy generated by the effect of air currents, and is transmuted into other useful forms of human activities.

Today, wind energy is mainly used to produce electricity through wind turbines. At the end of 2011, worldwide capacity of wind generators was 238 gig watts. In 2011 wind it generated about 3% of world electricity consumption. Wind energy in Spain produced 16% of electricity consumption in 2011. In the early hours of April 19, 2012, wind power reached 61.06% of the electricity produced in Spain, with instant power regarding 14.889MW 24.384MW demanded by the grid.

Wind energy is an abundant, renewable, clean and helps reduce emissions of greenhouse gases by replacing thermoelectric fossil fuel resource, which makes it a kind of green energy. However, the main drawback is its intermittency.