Apps let people play games, shop, read, get maps and directions, set appointments, and do many other tasks.
The inventor of the telephone series#
The invention was a series of electric cables through which.
Certain kinds, called smartphones, also run computer programs called applications, or apps. Elisha Gray and Alexander Graham Bell almost simultaneously invented the telephone in the 1870s. Many can take photographs, play music, get information from the Internet, and send and receive e-mail. Most can send text messages to other cell phones. Many cell phones can do things other than make calls. The signal lets the network know where to send the calls that come to that phone. Cell-phone networks can stretch across an entire country.Ī cell phone sends out a special signal whenever it is turned on. This means that a cell phone can work anyplace that the cell-phone company’s network reaches. If a caller travels from one cell into another, the call switches from tower to tower. Each cell has a tower for receiving and sending out radio waves. They send and receive calls using radio waves.Ĭell-phone companies divide up an area, such as a city, into sections called cells. Because of this, in some places they are called mobile phones. When the signal reaches the telephone at the other end, its loudspeaker changes it back into the sound of the caller’s voice.Ĭellular telephones, or cell phones, are even more convenient than cordless phones because they work over a much wider area. His interest in sound technology was deep-rooted and personal, as both his. Or the signal can be changed into radio waves and sent through the air by antennas and satellites. Alexander Graham Bell, best known for his invention of the telephone, revolutionized communication as we know it. This way of sending information is called fiber optics. It can travel through thin glass fibers in the form of light. It can remain an electric current, passing through wires and cables. How the signal travels from there depends on where the call is going. The base sends out the signal through its wire. When the caller speaks into a telephone, the microphone changes the sound of the person’s voice into an electric signal. The other end has a small loudspeaker for listening. One end of the handset has a microphone for The part that a person holds to make or answer a call. Has a handset and a base that are connected by a cord. A traditional telephone depends on wires to send sound.
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