1.
A computer is an electronic device that manipulates information, or
data. It has the ability to store, retrieve, and process data. You may
already know that you can use a computer to type documents,
send email, play games, and browse the Web. You can also use it
to edit or create spreadsheets, presentations, and even videos.
2. At a high level, all computers are made up of a processor (CPU),
memory, and input/output devices. Each computer receives input
from a variety of devices, processes that data with the CPU and
memory, and sends results to some form of output.
3. Let us identify the major characteristics of computer. These can be
discussed under the headings of speed, accuracy, diligence,
versatility and memory. As you know computer can work very fast.
It takes only few seconds for calculations that we take hours to
complete.
4. Ergonomics (or human factors) is the scientific discipline
concerned with the understanding of interactions among humans
and other elements of a system, and the profession that applies
theory, principles, data and methods to design in order to optimize
human well-being and overall system performance.
5. The most common input devices are the keyboard, mouse, and
touch screen. Portable keyboard, wireless mouse, and iPhone.
There are hundreds of other input devices, like microphones to
capture sound waves, scanners to capture image data, and virtual
reality devices to capture our body movements.
6. Utility software is a program specifically designed to help manage
and tune system or application software. It is used to support the
computer infrastructure - in contrast to application software, which
is aimed at directly performing tasks that benefit ordinary users.
7. Health professionals study, diagnose, treat and prevent human
illness, injury and other physical and mental impairments in
accordance with the needs of the populations they serve. They
advise on or apply preventive and curative measures, and promote
health with the ultimate goal of meeting the health needs and
expectations of individuals and populations, and improving
population health outcomes.