Chapter 5 - Input Devices Flashcards
(25 cards)
What is Hardware?
It is the physical component of the computer
What is Software
program and instructions run on a computer
What is an input device?
An input device is a hardware device that allows data to be input into a computer system.
Name an input device
Keyboard, mouse, camera, scanner , trackball (different type of mouse) , touch screen, microphone
What is the main and most common method of entering data onto a computer?
Keyboard
Name 2 advantages of a keyboard
1) Keyboards are very simple to use
2) If a person is trained to type fast then inputting data onto a computer can be very efficient
Name 2 disadvantages of a Keyboard
1) It is easy to make a mistake when using a keyboard to input data
2) If a person is not trained to type fast then inputting data can be very slow
What is a mouse?
A mouse is an input device that is used o control a pointer or a cursor on a screen. It enabled a user to move the pointer to navigate around the screen.
Name 2 advantages of a mouse
1) A mouse is very simple to use
2) A mouse lets the user navigate around the screen efficiently
Name 2 disadvantages of using a mouse
1) A user needs a flat surface next to the computer to move the mouse around. If this space is limited it can restrict the use of a mouse.
2) If the roller ball gets to clogged with first, or if dirt covers the optical laser, this can stop a mouse working properly,
Optical character recognition (OCR)
A process where text on a scanned document is recognised and converted to digital text.
Optical Mark recognition (OMR)
A process where scanned marks on a page are automatically converted to inputs
Optical character recognition (OCR)
A process where text on a scanned document is recognised and converted to digital text
Definition of Biometric device
A device that recognises human physical characteristics, such as fingerprints.
What a biometric device does
They are used to identify people. A persons biological feature are scanned, for example their retina, their fingerprints or their face, and the data from these are stored in a computer system. Once the physical features are scanned again, it will match it with the stored value in the system ( for example Face ID in newer Apple devices such as the iPhone 10/X
What is a sensor ?
A device that records physical inputs.
What is an analogue?
A signal, or data, that constantly varies
Digital
A signal, or data that consists of two states, 1 and 0
Name the Advantages of a Barcode
1) A barcode is very efficient method of entering a products details to find out its price.
2) A barcode can be used to help keep record of stock level for a product.
Name the Disadvantages of a Barcode
1) If the barcode is damaged, not printed clearly, or rubbed away in part, it may not scan properly
2) If the barcode data has not been recorded in the computer system, the barcode scanner will not be able to find it.
Def of Encoding
The process of converting data or information into a particular form
Advantages of a Digital Camera
1) Immediately seen on screen
2) Back up copies can be made of any digital images taken
3) Images taken with a DG can easily be shared
4) It can be easily edited
Disadvantages of a Digital Camera
1) If the Camera has very few pixels, the image quality will be lowered
2) When the photo is taken, it can be easily seen and shared, it can also be accidentally shared without the user wanting it to be shared.
3) If the user has a lot of photos then additional storage will be needed
Analogue-to-digital converter (ADC)
A device that converts analogue data into digital data.
