Answer to Question 1
The Internet (short for interconnected network) is a global network of networks connecting innumerable smaller networks, computers, and users. It is run by a committee of volunteers; no one owns or controls it. The Internet originated in 1969 as ARPAnet, a project of the Advanced Research Projects Agency of the U.S. Department of Defense. The Department of Defense was attempting to create both a national network of scientists and a communications system that could withstand a nuclear attack. The network was, therefore, to be decentralized, forming a communications web with no central authority. The protocol that eventually governed ARPAnet and continues to govern the Internet today is public domain software called transmission-control protocol/Internet protocol (TCP/IP).
Answer to Question 2
During the last few years, the use of wireless technologies has expanded. Smart phones, global positioning system (GPS) technology, and personal digital assistants (PDAs) with Internet access have become common. In places without electricity or landlines, wireless networks using cell phones and PDAs are both bringing health information to people and gathering information to track the spread of disease. Wi-Fi is a wireless technology that allows you to connect, for example, a PDA (and other devices) to a network (including the Internet) if you are close enough to a Wi-Fi access point. Smart phones and tablet computers contain a wide variety of health-related applications and have quickly become widely used in health care environments.
The patient and his family meet with the nurse to discuss progress on the patient care plan.
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For the circuit in Figure 1, assume ideal diodes. The peak inverse voltage is approximately