ICT chapter 2 Input and output devices

What are the touchpads uses

Their used are the same as the mouse 1)opening,closing and minimizing software 2)grouping,moving and deleting files 3)image editing,for example controlling the size and position of a drawing pasted into a document. 4)controlling the position of a pointer on the screen to allow selection from a menu or selecting an icon ,and for scrolling up and down /left and right.

Define output devices

These are hardware devices that allow data to be output from computer.

Give 4 places of where it is used

1)Automatic teller machines (ATMs),where the customer can key in their pIn,amount of money,etc. 2)Mobile phones to allow phone numbers etc to be keyed in. 3)Point-of-sale(POS)terminals in case the barcode reader fails to read the barcode-the number has to be keyed in manually by the operator. 4)Chip and PIN devices when paying by credit/debit keys(Key in PIN,amount of money,etc) 5)Fast entry of numeric data into a spreadsheet.

What are 4 advantages of a trackerball?

1)Doesn't need the same fine control as a mouse. 2)Easier to use than a mouse if the operator is disabled. 3)More accurate positioning of the pointer on screen than a mouse. 4)They are more robust than a mouse 5)Needs less desk space than a mouse or a keyboard.

Give 3 advantages of a keyboard

1)Fast entry of new text into a document 2)Easy to use for most people. 3)Easier to do verification checks as the data is entered (can immediately compare the source document with typed data on the screen)

Name 2 uses of keyboards

1)Input of data into application software(for example,text into word processors,numbers into spreadsheets,etc.) 2)Typing in commands to the computer(for example,Prnt Scrb,Ctrl+P to print out etc.

Give 3 disadvantages of the keyboard

1)It can be difficult to use if the user has limited arm/wrist use. 3)Slow method when compared to direct data entry(for example,optical Mark recognition) 3)Fairly large device that uses up valuable desk space.

Name 2 advantages of a numeric keyboard

1)It's faster than standard keyboards when entering numeric data. 2)Since many are small devices (for example,mobile phones)they are very easy to carry around

What are 6 advantage of using LEDs instead of CCFL technology?

1)LEDs reacjh their maximum brightness almost immediately(there is no need to "warm up" before reacghing full efficiency) 2)LEDs give a whiter light,which sharpens the image and makes the colours appear more vivid:CCFL hada slightly ellowish tint. 3)LEDs produce a brighter light, which improves the colour definition. 4)Monitors using LED technology are much more thinnerb than monitors using CCFL technology. 5)LEDs last almost indefinitely:this makes the technology more reliableand makes for a more consistent product. 6)LEDs consume very litttle power, which means they produce less heat as well using less energy.

Give 2 disadvantages of a trackerball

1)Not supplies with computers as standard ,therefore more costly 2)user may need training since it isn't standard equipment.

What are 4 uses of a mouse?

1)Opening,closing and minimizing software. 2)grouping,moving and deleting files. 3)image editing,for example controlling the size and position of a drawing pasted into a document. 4)Controlling the position of a pointer on the screen to allow selection from a menu or selecting an icon,and for scrolling up and down/left and right.

Give 3 disadvantages of a touchpad

1)People with limited hand/wrist movement find the device difficult to use. 2)Can be more difficult to control the pointer when compared to a mouse. 3)More difficult to use when doing certain operations such as drag and drop.

2 Disadvantages of TFT monitors.

1)The angle of viewing a TFT is fairly critical otherwise the image isn't very clear (for example, if several people are looking at a screen at the same time) 2)Definition is sometimes not as good as a CRT monitor.

2 Advantages of a CRT monitor

1)The angle of viewing is still better than with most TFT monitors. 2)They work with light pens in CAD/CAM applications.

What is an advantage of OLEDs?

1)They allow screens to be curved which ensures a good picture from any jungle.

3 Advantages of TFT monitors ?

1)They are lightweight and don't pose the same risk as CRT monitors. 2)They produce less glare than CRT monitors and also emit less radiation. 3)They consume much less power and don't generate as much heat as a CRT monitor.

What are 2 uses of TFT monitors?

1)They were used as the primary output device for computers so the user can see immediately what they are typing in. 2)They are an integral part of laptop computers.

What are 2 uses of CRT monitors?

1)They were used as the primary output device for computers so the user can see immediately what they are typing in. 2)They are used with light pens, for example to allow designs to be created on screen

Name 3 uses of a trackerball

1)Used in applications where the user has a disability(such as RSI) 2)Used in control room environment where it is faster than a mouse to navigate through process screens. 3)used in some luxury cars to select functions such as radio,telephone,music,satnav and so on.

Give 3 disadvantages of a mouse

1)can be more difficult for people with restricted hand/wrist movement than using a keyboard data entry. 2)easy to damage and the older type of mouse quickly becomes clogged up with dirt. 3)difficult to use if no flat surface is readily available (for example,on an aéroplane)

Name 3 advantages of a mouse.

1)faster way to choose an option than using a keyboard. 2)very quick way to navigate through applications and the internet 3)doesn't need a large desk area when compared to a keyboard.

Give 2 advantages of a touch pad

1)same as the mouse(faster than a keyboard for choosing options,used to navigate applications and the internet etc). 2)Since the touchpad is integrated into the laptop computer there is no need for a separate mouse -this aids the portability and is also a big advantage of there are no flat surfaces available.

Name 2 disadvantages of numeric keyboars

1)sometimes have small keys which can make input more difficult. 2)sometimes the order of the numbers on the keypad isn't intuitive.

How are LCDs and TFTs similar?

LCDs are simply a development of TFTs.

What does LED stand for?

Light Emitting Diode

What does LCD stand for?

Liquid crystal display?diode

Which people find it easier to use a trackerball?

People with limited hand/wrist movement.

How many buttons do trackerballs have?

Some have 2 buttons which have the same function as the left and right mouse buttons.if they have a third button it is equivalent to a double click.

Which layout do keyboards use ?

The QWERTY layout and it comes from the keys on the top row which spell out 'QWERTY "

Define a concept keyboard

The concept keyboard uses icons or phrases instead of standard lettersz

Describe monitors that are made using LCDs .(4 point)

The front layer of the monitor is made up of liquid crystal diodes:these tiny diodes are grouped together in threes or fours, which are known as pixels(picture elements).The three colours that are grouped together use red, green and blue diodes.Those systems that use groups of four include a yellow diode this is said to make the colours more vivid.

How are touchpads used?

The pointer is controlled by the user moving their finger on the touchpad and then gently tapping it to stimulate the left button of a mouse.

Give an example of a place that uses this keyboard and how they use it

These are often used in fast-food restaurants,where a single key represents one item ,for example an ice-cream.The person serving only needs to touch this key to order the ice cream and bring up its price on s screen.

Define keyboards

These are the most common input devices and are used to input text,numbers and instructions into the computer

Why are egonomic keyboards helpful?

They are designed to reduce the health-related problems associated with standard keyboards,such as carpal tunnel syndrome and repetitive strain injury(RSI)

How expensive are CRT monitors?And how common are they?

They are the least expensive type of monitor, although they are becoming increasingly rare as TFT monitors are now taking over.

What sizes can you find the CRT monitors in and how do they work?

They come in various sizes and make use of an electron gun firing against a phosphor screen. The picture is made up of tiny dots that are coloured red, green, or blue-the intensity of each coloured dot makes up the vast range of colours interpreted by the eye.

Why do mouses have a scroll button?

They speed up the process of moving through a document.

4 Disadvantages of a CRT monitor

They tend to be rather heavy and present a safety hazard if not supported properly. 2)They run very hot and can cause fires if left unattended(especially as they get older) 3)They consume considerably more power than modern TFT monitors 4)They can flicker, which can lead to headaches and eyesight problems with prolonged use.

How will OLEDs work?

They will use organic materials (made up of carbon compounds)to create semi-conductors that are very flexible.

What does TFT monitors stand for?

Thin film transistor monitor

Define a touchpad

Touchpads are used as many pointing devices in many laptop computers.

What are trackerballs

Trackerballs are similar to a mouse except that the ball is on top or the side of the device.

How many buttons do the mouse have and how do they work?

Two buttons and the left button is usually used to select items by double clicking while the right button brings up drop-down menus.

Give 3 reasons why people use a concept keyboard.

1)It allows fast data entry(ne need to type in whole commands) 2)The keyboards are waterprrof(useful in a restaurant environment) 3)Also in certain applications(for example,at unmanned airport information kiosk),these keyboards are tamper resistant,preventing people from keying in information that could potentially corrupt the computer system.

Give 2 examples of input devices

1)keyboard 2)barcode readers

Give an example of hardware devices that hold the data temporarily.

A printer buffer/memory.

Give an example of a data device that produces permanent output in the form of a hard copy

A printer producing output on paper.

Why have LEDs becom increasinngly more popular?

Because it has a lot of advantages over older CCFL technology.

What does CRT monitors stand for?

Cathode Ray tube monitors

What did LCDs use before LEDs as their backlighting method?

Cold cathode flourescent lamp(CCFL)

2.3.Output devices and their uses

Goodluck

Whats the most important aspect of OLEDs?

How thin it make the screen.

What does LED do?

It gives the image better contrast and brightness.

What is an advantage of a optical mouse?

It has no moving parts and it also doesn't pick up any dirt.This makes it more robust and improves its performance since the older type of mouse can 'skid' on certain surfaces ,reducing the control of the pointer.

Define the mouse

It is an example of a pointing device.

Define numeric keypads

It is used to enter numbers only (although some have a function key to allow alphabetic characters to be input)

What is the cordless or wireless mouse?

It transmits signals to USB wireless receiver plugged into the computer.

How does CCFL work compared t LEDs?

It uses two fluorescent tubes behind the LCD screen which supplies the light source.But when LEDs are used, a matrix of tiny LEDs is used behind the LCD screen.

Which backlit technology do LCDs use to emit light?

Modern LCD monitors are backlit using LED technology.

What is a optical mouse?

Movement is detected by reflected light rather than the position of a moving ball

Does LCD emit light?

No

Do trackerballs need desk space?

No because they don't physically move.

Describe in detail how OLEDs work.(4 points)

Organic fimls are sandwiched between two charged electrodes(one is metallic and the other a glass anode).When an electric field is applied to the electrodes they give off light.This means no form of backlighting is required, which allows for very thin screens. It also means that there is no longer a need to use LCD technology , since OLED is a self-containes system.

What will future LED technology use?

Organic light emitting diodes(OLEDs)

Why are TFt monitors taking over CrT monitors?

The screen is made up of thousands of tiny pixels, which are made up of transistors controlled by a microprocessor. Each pixels has three transistors that are coloured red, green or blue- the intensity of each governs the effective colour of the pixel seen by the eye.

How does a trackerball work?

The user controls the pointer on the screen by rotating the ball with their hand.

How does the mouse work?

The user controls the position of a pointer on the screen by moving the mouse around.

What are Input devices?

These are hardware devices that allow data to be input into a computer.

Do touchpads have buttons like a mouse?

Yes they have buttons under the touchpadwhich serve the same function as the left and right buttons on a mouse.