Alexander Graham Bell invented the first speaker in the world in 1875. This was the world’s first audio speaker in the world which plays back the voice of the caller. It’s not very easy for anyone to make a speaker; a person must have the knowledge of sound waves, electricity, mechanics, chemistry and physics. A special training is given to an engineer in his college if he chooses this line. At the start of the 20th century, some basic knowledge of math’s and frequency has been developed till today.
The main part of the speaker that is electromagnet was invented in the year 1860 by C.W. Rice and E.W. Kellogg; well, it takes more than 40 years to discover the facts of acoustics. Finally, the inventor solved the puzzle and made the electromagnet which gives sounds to speakers. Electromagnet changes an electric signal into varying movement, so it can work properly.
