The purpose of the telephone is to audibly communicate with other people who are far away instantly and efficiently. Before the telephone, long distance communication was done with telegraph machines which were less efficient and took longer to get messages across since only dots and dashes could be communicated.Know More
Telephones are particularly useful for quick communication in emergencies. The key to medical survival in many situations is for the injured person to get medical attention quickly. Before the telephone, it was more difficult for people to get help quickly.
Telephones allow for quick communication during natural disasters as well. That way it is possible for the government to warn people of impending disaster before they arrive. Since electrical signals travel at the speed of light, the government can inform people of coming hurricanes, earthquakes and other disasters that travel considerably slower. When communication was done only through people riding on horses, it was impossible to outrun natural disasters.
Telephones also have the purpose of simple communication in everyday situations such as calling to order items such as pizza or flowers. People may communicate in a normal way to talk about their lives just as they would if they were in the same room.Learn more in Mobile
For a phone to function properly, a duplex coil and frequency generator/touch-tone keypad are needed. With a landline phone, two copper wires run from a box at the road to a box in the house. According to How Stuff Works, the way telephones work has not changed in nearly a century. In the simplest telephones, there are only three small parts: a hook switch, a speaker and a microphone.Full Answer >
PBS explains that deaf people use telephone typewriters and telecommunications devices to communicate over the telephone. These devices resemble electronic typewriters and feature a screen that displays text. PBS explains further that telephone typewriters and telecommunications devices are only able to receive calls from similar devices as the calls are transmitted over the phone line as a series of beeps. Telephone typewriters and telecommunication devices are also referred to as "TTYs" and "TTDs."Full Answer >
A VPN, or virtual private network, on an iPhone is a simulated point-to-point connection that enables the iPhone to communicate securely over a public network using Wi-Fi or a cellular data network. A VPN can be set up using virtual tunneling protocols or encryption to manage network traffic.Full Answer >
Near-field communication uses low-frequency waves to communicate between two antennae at very short ranges under a few inches. One example of this technology uses a cellphone to transmit a weak radio signal to a magnetic tag embedded in a nearby poster, piece of merchandise or electronic pay device. The active device, or the cellphone, generates a small magnetic field, whereas the passive tag in the object reacts to that field.Full Answer >