Erika Borda

Phone

The phone or teletrofono, is a device that transmits sound signals remotely. He was given the patent to Alexander Graham in 1876, but after many years finally gave Pat Meucci the true inventor who discovered it in 1871.

The phone operates with the current flow through a circuit, these have different variations, variations are then converted by a resistor. The phone also includes a sheet next to electroiman finally converted into sound variations.