The phone is a communication instrument that is designed to transmit speech and other sounds at a distant point and play with the help of electricity. The phone contains a diaphragm, which vibrates when sound waves hit. The vibrations (wave motion) are converted into electrical impulses and transmitted to a receiver, which converts the impulses back into sound.
This device has proven to be one of the most important for humans. With the discovery of the way in which evolve human history changed radically. Before the invention of the telephone, the means exist (for example, various types of telegraph) was not sufficient for communication between people. The phone was the device that allowed the direct and rapid communication. In this way it was possible to update any fact from all around the world within minutes.
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