COMPUTER HARDWARE: Output Devices
These are devices used to 'see' the results of any processing of any data entered into the
computer through any of the input devices described earlier.
1. Printers
Computers were supposed to bring about the dream of a 'paperless office'. This now looks
very unlikely to happen because paper has got some advantages over computers when
looking at information.
Advantages of Paper
4. Digital Still Cameras. So common they are included in phones.
1. It is very portable. The information on a sheet of paper is
easily passed around, and many people can look at the
information at the same time.
2. It is cheap. Initial costs of computers means there is no comparison with the cost
of using paper.
3. Not everyone has computer equipment to view information, or it may
be difficult to use computers in some situations.
Paper copies, or hard copies, of information will always be needed. Printers (and plotters)
are used to produce these hard copies. The main different types of printer, and how they
are compared against each other, are explained below.
a. Laser Printers
This type of printer is the main one used in schools, offices and
industry because it produces high-quality printouts very quickly,
with good resolution.
How it works?
It uses a laser to make a negative electrical image of the
page on a positively charged drum, which then picks up
positively charged toner.
The drum rolls over the paper and the toner is heated to print on to the page. The
toner cartridge gives many copies before needing replaced keeping running costs
down.
Laser printers are generally more expensive than inkjet printers, but their running
costs are lower.
http://ecampus.maseno.ac.ke
These are devices used to 'see' the results of any processing of any data entered into the
computer through any of the input devices described earlier.
1. Printers
Computers were supposed to bring about the dream of a 'paperless office'. This now looks
very unlikely to happen because paper has got some advantages over computers when
looking at information.
Advantages of Paper
4. Digital Still Cameras. So common they are included in phones.
1. It is very portable. The information on a sheet of paper is
easily passed around, and many people can look at the
information at the same time.
2. It is cheap. Initial costs of computers means there is no comparison with the cost
of using paper.
3. Not everyone has computer equipment to view information, or it may
be difficult to use computers in some situations.
Paper copies, or hard copies, of information will always be needed. Printers (and plotters)
are used to produce these hard copies. The main different types of printer, and how they
are compared against each other, are explained below.
a. Laser Printers
This type of printer is the main one used in schools, offices and
industry because it produces high-quality printouts very quickly,
with good resolution.
How it works?
It uses a laser to make a negative electrical image of the
page on a positively charged drum, which then picks up
positively charged toner.
The drum rolls over the paper and the toner is heated to print on to the page. The
toner cartridge gives many copies before needing replaced keeping running costs
down.
Laser printers are generally more expensive than inkjet printers, but their running
costs are lower.
http://ecampus.maseno.ac.ke
