No need to move, the radio brings you the world, thanks to a wonderful world of waves, electricity and scientific inventions.Using specialized equipment emitting electromagnetic waves, then passed, until finally they are received by us
Imagine you are on the shore of a lake and decide to throw a stone into the water. If the lake's surface is smooth, you'll see how the sudden fall of stone in the water as waves. In many respects, the radio in your house works exactly the same.
The stone is not released alone, or get out of the soil alone: this requires energy, more specifically, we need the energy. So with the radio. The first thing that works is required to power.
In the case of the stone thrown into water, the waves produced will extend several meters, because the energy has crossed a certain distance. A radio station produces a similar action: by means of electricity, the waves are transmitted into space and travel some distance to reach the receiver. The music or the news we hear on the radio have to travel the distance between the issuing station and where heard.
To reach the modern radio today, humanity had a long journey of research and experiments.
The mystery of sound waves
When we contemplate the waves above understand that they can sail a boat. Radio waves are invisible, yet is easy to understand that we can use, making it work for us.
First, let's establish that there are many types of waves, such as marine, lighting, heat or magnetism. To understand how the radio, we will, specifically in the airwaves.
One method of communication that we all use the sound waves, talking and listening to the transmit receive them, provided they are issued with the amount of energy required so that we can hear.
Our hearing aid picks up sound through vibrations emitted.Thanks to a complex physical, chemical and biological our body, air vibrations reaching the ear are sent to the brain as nerve impulses. This complex process is still largely unknown, but is known to have related to our memory and understanding.
The radio works similarly: converts sound into electrical impulses, to take place far from where they originated.
The operation of the radio is actually very simple. The sounds captured by microphones, which are at the headquarters of the station, travel to your home converted into electromagnetic signals. To do this, first go from the transmitter to an antenna, which produce electrical changes, finally, thanks to an electrical transformer that reproduces and magnificent comes to your home. Once there, another set of components that are on your radio receiver transform sound again, to enjoy your favorite songs and stations.
Basically need three types of components that we may hear the radio:
Broadcast System: Located on the radio station. Here the sounds are converted into electrical impulses that travel to the antenna of the station.
Transmission System: located away from the station, preferably in high places or clear. Here the original signal is amplified and through invisible waves traveling through the air to reach every home. Note that each station both FM and AM has its own frequency, that is, their own code to capture and send vibrations.Therefore, only hear a station at each point on the dial of your radio receiver. Otherwise, all stations would mix in your radio you could hear well without any.
Receiving System: which is nothing but each radio. As the microphone converts the sound into electricity, horns or speakers do the exact opposite. Convert or transform electrical impulses into sound. To do this, like our ears, are based on the intensity (acute or severe) of each electrical impulse and decoded.
In the second half of last century scientists sought a form of wireless communication, after many attempts with electromagnetic waves, they finally reached the best results.
The Scot showed Clark Maxwell mathematically how the electromagnetic action is spread with a wave motion. In 1887, the German Heinrich Hertz, periodic currents using very high frequency, demonstrated the existence of electromagnetic waves, transforming the wave motion in an easy phenomenon to study and measure in a laboratory. Therefore, and in honor of the scientific studies, the electromagnetic waves used in radio are measured in Hertz and are known as radio waves.
After further advances, it is up to the Italian Guglielmo Marconi was honored to be the "discoverer" of the radio. First invented radio apparatus, an instrument able to transmit sound impulses away in Morse code. To reach their findings, Marconi began experiments very young (when she was 20 years). You know what was the first laboratory Marconi? The stables of his house on the outskirts of the city of Bologna in Italy!
Over time and after performing signal transmission distance telegraphy, Marconi achieved the great event which had always dreamed of: transmitting the human voice at a distance, without using cables. To achieve this, Marconi was experimenting for over 30 years. But definitely worth it!
Thanks to his perseverance, humanity now enjoys an excellent means of communication.
* Descartes, René: Philosopher, French physicist and mathematician born in La Haye, France in 1596. While it is currently best known as a thinker, scientists of his day took his discovery of analytic geometry, and the findings made by outlining the fundamentals of geometrical optics.
Descartes created a new method of reasoning and modern metaphysics.
* Dynamo: Name abbreviated designating the dynamo-electric machine, which converts mechanical energy into electrical energy or vice versa as appropriate and useful.
Simply put, the dynamo is the machine responsible for sending or distributing electricity within a machine (hence the saying goes: "Fulanito sends more than a dynamo.") To operate the dynamo requires an inductor (magnetic polar mass) and an armature (rotor spinning due to the attraction-repulsion of the magnet).
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