Chapter 2 Flashcards
What are the four common display devices?
Cathode Ray Tube CRTs
Projectors
Flat screens
Touchscreens
Cathode Ray Tube (CRT)
an electron gun shoots a beam of electrons toward the back side of the monitor screen
use three guns, one for red, green, and blue image components,
each gun works only on dots of a certain color
screen is coated with special chemical dots called phosphors
each pixel is formed by a triangle of red, green, and blue phosphor called a triad
Dot pitch:
the measurement between triads on the display.
Expressed in millimeters or dots per inch
Resolution:
how many pixels are used to draw the screen
indicate how many rows and columns of pixels are used to draw the screen
What is an advantage of higher resolution screens?
more information can be displayed in the same screen area
What is a disadvantage of higher resolution screens?
the same objects and text displayed at a higher resolution appear smaller and might be harder to see
Liquid Crystal Display Monitor (LCD):
has two polarized filters, between which are liquid crystals
light must pass through both filters and crystals
by applying current to the crystal it causes it to twist so that it matches the angle of the second crystal and allows the light to pass through
Light-Emitting Diode Monitor (LED):
are just LCD panels with light emitting diodes
rival plasma displays in clarity and variations in luminance
Plasma display panels (PDP):
create a cloud from inert gas, such as neon, by placing electrodes in front of and behind sealed chambers full of gas and vaporized mercury
Full Name; Year Introduced; # of Pins in Connector; Analog or Digital:
VGA
Video Graphics Array; 1987; 15-pins; Analog
Full Name; Year Introduced; # of Pins in Connector; Analog or Digital:
Digital Visual Interface (DVI):
Digital Visual Interface; 1999; 24; Both Analog and Digital
Full Name; Year Introduced; # of Pins in Connector; Analog or Digital:
HDMI
High-Definition Multimedia Interface; 2002; 19; Digital
Year Introduced; # of Pins in Connector; Analog or Digital:
DisplayPort:
2008; 12; Both Analog and Digital
What are some of the types of external storage?
Flash Drives
Memory Cards
Secure Digital (SD
External Hard Drive
What are the three prominent standards of memory cards?
Smart Media
Compact Flash
Secure Digital (SD)
Network-attached storage (NAS) device:
attached to the network, allows users access to storage space
can hold up to four hard drives, some hold more or less
allow you to replace failing hard drives without shutting down
contains its own operating system
good device if you are running a small office and need additional centralized storage
What are four types of connectors that you’re most likely to see with external hard storage devices?
USB
eSATA
FireWire
Thunderbolt
Year; Speed:
USB 1.1
1998; 12 Mbps
Year; Speed:
USB 2.0
2000; 480 Mbps
Year; Speed:
USB 3.0
2008; 5 Gbps
Year; Speed:
USB 3.1
2013; 10 Gbps
Year; Speed:
USB 3.2
2017; 20 Gbps
External SATA (eSATA) connector:
can support up to 15 devices on a single bus
does not provide power
eSATA Year; Speed:
Revision 1.0
2003; 1.5 Gbps
eSATA Year; Speed:
Revision 2.0
2005; 3.0 Gbps
eSATA Year; Speed:
Revision 3.0
2009; 6.0 Gbps
FireWire:
high-speed digital connection
found a niche home with digital video cameras
can connect up to 63 devices on a single bus
Year; Speed:
Thunderbolt
2011; 10 Gbps
Year; Speed:
Thunderbolt 2
2013; 20 Gbps
Year; Speed:
Thunderbolt 3
2015; 40 Gbps
Registered Jack (RJ)-45
an ethernet connector
sometimes called Cat 5 or Cat 6 (Category)
What are the three types of wireless connection?
Wi-Fi
Bluetooth
Radio frequency (RF)
Registered Jack (RJ)-11
a telephone connector; must have a modem for internet
QWERTY
The most common configuration for Latin Script on keyboar
DVORAK:
an alternative to QWERTY
designed to place more commonly used letters in better spots, increasing your typing speed
What are the five types of pointing devices in use today?
Mouse
Touchpad
Joystick
Stylus Pen
Trackball
Joysticks:
used in aviation before computers were invented
specialized computers used joysticks in the 1940s
a stick and a button or two to indicate action
Trackball
introduced in 1946
inverted mouse with a ball
you roll it around with your thumb and/or fingers
What the the two most common printer technologies?
Inkjet
Lasers
Inkjet printers:
the most popular choice
sprays ink on the page to form the image
CMYK cartridges:
All ink in one cartridge
Cyan, Magenta, Yellow, Black
Laser printer:
bigger, faster, and more expensive than inkjet printers
use a dry powdery plastic resin called toner which is stored in a replaceable cartridge
the image is formed on the printers drum and jumps off onto the paper
four separate toner cartridges (CYMK) colors
Serial Connections:
when computers send data serially, they send it 1 bit at a time
Parallel Connections:
sending data 8 bits at a time over eight separate wires (1 for each bit)
What are the two choices when connecting a printer to a network?
Network cable (typically RJ-45)
Wireless networking
What are the steps for a installing an internal device?
Always make sure that the computer is powered off
Remove the component you are replacing
Identify the slot or connection you will use for the new device
Insert the new device. Make sure to connect power if it requires a direct connection to the power supply
Turn the computer back on
Plug-and-play:
When the OS automatically detects the new device and installs the proper driver
Full Name; Year Introduced; # of Pins in Connector; Analog or Digital:
MDP
Mini DisplayPort; 2008; 20; Both Analog and Digital
Year Introduced:
Thunderbolt
2011
Year Released; Primary Uses:
PS/2;
1987; Keyboards and mice
Year Released; Max Speed; Primary Uses:
Parallel
1970; 20 Mbps; Printers
Year Released; Max Speed; Primary Use
Serial (RS-232)
1962; 115 Kbps; Modem, printers, mice, control console for server and router management
Year Released; Max Speed; Primary Uses:
RJ-45
1976; 10 Gbps; Network cards
Year Released; Max Speed; Primary Uses:
RJ-11
1976; 56 Kbps; Modems
