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Printer
A printer is an output device that is used to get the output on a physical medium like paper. The output on the
screen is called a soft copy whereas the output from the printer is called a hard copy. It can be used to print both
text and graphics. The two most common types of printers used these days are inkjet and laser printers.
Inkjet Printer
Inkjet printers are also called photo printers. They are used to print both in coloured
or black & white format for home or small business purposes. The speed of an
Inkjet Printer inkjet printer is measured by the number of Pages Per Minute (PPM). Mostly inkjet printers
print from 12 to 36 pages per minute.
Laser Printer
A laser printer works just like a photocopy machine that prints the output at high-speed and
good quality. It creates images using a laser beam and powdered ink called toner. It is more
expensive than inkjet printers and can be used for home or business purposes.
Laser Printer
Plotter
A plotter is an output device similar to a printer but used to print vector graphics like architectural
designs, maps, computer aided drawings etc. by plotting lines using a pen. A printer uses a
technology of joining closely spaced series of small dots to print whereas a plotter draws using
a pen. Multicolour plotters use different-coloured pens to draw in different colours.
Plotter
Speakers
Speakers are an output device that produce sound waves in the form of an output which
can be heard by a listener. Speakers can be attached to a computer or to any other system
like smartphones, tablets, Smart TV, etc. to enhance the volume and the quality of audio
output. The different kinds of speakers range from simple, two-speaker output devices to
surround-sound multi-channel units. Speakers
Projector
A projector is a display device that projects a computer screen onto a flat surface, like a
whiteboard or wall. It is most commonly used in home theaters or in organisations for official
Projector presentations.
Computer Memory
Computer memory holds raw data before it goes for processing and after processing it contains information which
can either be sent to output devices or stored in secondary storage devices for future use. There are two types of
memory in the computer— primary memory and secondary memory.
Primary Memory
This type of memory is necessary for a computer to work. It is also called the Internal Memory. This is the actual place
where the data is stored before it is taken to ALU for processing. Primary memory is of two types: RAM and ROM.
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