Unit 2 - Input and Output Devices Flashcards
What layout does a standard keyboard use?
QWERTY
What does EPOS stand for?
Electronic Point Of Sale
What does ATM stand for?
Automatic Teller Machine
Give advantages of a keyboard.
Need little training, a skilled typist can enter data very quickly and often computers come with a keyboard supplied
Give disadvantages of a keyboard
It is prone to human error since all data has to be keyed in, if you cannot touch type it can be time consuming to enter data and excessive use can lead to RSI.
What does RSI stand for?
Repetitive Strain Injury
What can a mouse be described as?
A ‘pointing device’
Name 3 types of mouse
Infrared, mouse ball and wireless
Give advantages of a mouse.
Easy to use, inexpensive and designed to fit under the human hand.
State one disadvantage of a mouse.
Experienced users may find using a mouse slow, compared to using hot keys such as Ctrl + P to print
Give a use for a joystick
Playing flight simulators
What does a joystick do as you manoeuvre it?
It senses movements and converts them into coordinates.
Apart from the lever, describe the other functionality that a joystick has.
It has a range of buttons that can carry out specific, pre-programmed actions
Give one advantage of a joystick
Provides a better experience when playing a flight simulator
What are ‘input devices’?
Hardware devices that allow data to be entered into a computer
What are the two types of input devices?
Manual input devices
Direct input devices
Manual input devices
Data is input into the computer by hand (people have to do most of the work).
What is a Keyboard?
Text, numbers and instructions
Used to input data into applications
Used to enter commands into the computer
What are Numeric keypads?
Used to enter numbers into a computer system
Used in: ATMs, telephones, chip and pin devices
What is a Remote control?
Used to control other devices using infrared signals
Home entertainment systems use remote controls: DVD / Blu-ray players, TV etc.
Industry uses remote controls to operate machinery that might be too dangerous to get near to: activating explosives in demolition.
What are Scanners?
Used to enter information on paper into a computer.
Reflects light off the hard copy in order to capture an analogue image of the document then converts it to digital format.
E.g. old photograph (analogue) -> scanner converts photo into digital data -> digital data can be stored on a computer.
What is a Graphics tablet
Used by artists and designers to easily create and store digital graphics in a computer
Whatever is drawn onto tablet can be seen on a computer screen.
Allow designers to produce digital images much more accurately than if they were using a mouse.
What are Microphones
Used to input analogue sounds into a digital computer.
Used in voice recognition software.
Used in gaming so that gamers can talk to each other.
What are Digital Cameras
Store digital photographs on a memory card.
Built-in screen to allow for previewing
Capture video and sound
Exists in almost all modern mobile phones.
Direct input devices
Data is input into the computer directly by a machine / device.
What are
Barcode readers
Reads and outputs printed barcodes to a computer.
Used in supermarkets, stores
Advantages of barcode readers
Advantages:
Quick & easy to change products price (all digital)
Easy to get info on system (only have to scan)
Automatic stock control.
Very accurate->no typing
Disadvantages of barcode readers
Disadvantages
Expensive(each item needs a barcode / computer technology / database needed)
Can only read undamaged barcodes
Barcodes can be swapped.
Optical mark readers (OMR)
Captures human-marked data
Often used to read multiple choice examinations where students shade in areas they think are correct.
Advantages of OMR
Advantages
Very fast method of marking because it is automatic.
Accurate because it automatically transfers data.
Can save money from employing people.
Disadvantages of OMR
Disadvantages
Forms need to be accurately designed.
Can only read shaded areas.
If forms are filled incorrectly, they cannot be read.
Magnetic ink character recognition (MCR)
Read information printed in a special ink, then convert it into form that computer can understand.
Write customer account numbers on cheques.
Advantages of MCR
Advantages
Cheques can be processed very quickly.
Special ink characters cannot be changed, increases security.
No manual inputs -> less errors.
Disadvantages of MCR
Only limited characters can be read.
More expensive than other devices.
Magnetic Stripes Reader
Read magnetics stripes that are found on back of credit cards, loyalty cards etc.
Magnetic strips contain the user’s personal details such as account no, and name.
