Flashcards
Revision
Cards in this deck (20)
- 1What is an input device?In computing, an input device is a piece of computer hardware equipment used to provide data and control signals to an information processing system such as a computer or information appliance.
- 2What is an output device?An output device is any device used to send data from a computer to another device or user. Most computer data output that is meant for humans is in the form of audio or video. Thus, most output devices used by humans are in these categories. Examples include monitors, projectors, speakers, headphones and printers
- 3What is a storage device?Data storage is the recording of information in a storage medium. Recording is accomplished by virtually any form of energy. DNA and RNA, handwriting, phonographic recording, magnetic tape, and optical discs are all examples of storage media
- 4What is the purpose of a power supply?Computers use switching power supplies. The main functions of a power supply include the following: Convert AC to DC. Provide DC voltage to the motherboard, adaptors, and peripheral devices
- 5What is the purpose of the computer case?A computer case, also known as a computer chassis, tower, system unit, cabinet, base unit, or simply case, is the enclosure that contains most of the components of a computer (usually excluding the display, keyboard and mouse)
- 6What is the purpose of the motherboard?A motherboard is one of the most essential parts of a computer system. It holds together many of the crucial components of a computer, including the central processing unit (CPU), memory and connectors for input and output devices
- 7What is the purpose of the Processor?The most important component of a computer is the central processing unit, or CPU, also called the processor. The processor acts as the computer's brain, running programs and sending and receiving signals to attached devices to keep the computer running.
- 8What is the purpose of the RAM?RAM (random access memory) is the place in a computing device where the operating system (OS), application programs and data in current use are kept so they can be quickly reached by the device's processor. ... Data remains in RAM as long as the computer is running. When the computer is turned off, RAM loses its data.
- 9What is the purpose of ROM?Once data has been written onto a ROM chip, it cannot be removed and can only be read. Unlike main memory (RAM), ROM retains its contents even when the computer is turned off. ROM is referred to as being nonvolatile, whereas RAM is volatile.
- 10What is the purpose of the Hard Drive?The most important characteristic of a hard drive is how much data the hard drive can store, referred to as the storage capacity. A typical internal hard drive for a new desktop computer or laptop has a storage capacity of several hundred gigabytes (GB) up to one terabyte (TB).
- 11What is a repetitive strain injury (RTI) and what causes them?Repetitive strain injury (RSI) is a general term used to describe the pain felt in muscles, nerves and tendons caused by repetitive movement and overuse. It's also known as work-related upper limb disorder, or non-specific upper limb pain.
- 12What is the cause of back injuries when using a computer?Posture-related injuries from computer use. Back and neck pain, headaches, and shoulder and arm pain are common computer-related injuries. Such muscle and joint problems can be caused or made worse by poor workstation (desk) design, bad posture and sitting for long periods of time
- 13What is eye strain and what is the cause?Eye strain is a symptom, not an eye disease. Eye strain occurs when your eyes get tired from intense use, such as driving a car for extended periods, reading, or working at the computer. If you have any eye discomfort caused by looking at something for a long time, you can call it eye strain.
- 14By law, what do employers have to provide for their employees?It is an employer's duty to protect the health, safety and welfare of their employees and other people who might be affected by their business. Employers must do whatever is reasonably practicable to achieve this. ... Employers have duties under health and safety law to assess risks in the workplace.
- 15What is the purpose of Binary?A binary code represents text, computer processor instructions, or other data using any two-symbol system, but often the binary number system's 0 and 1. The binary code assigns a pattern of binary digits (bits) to each character, instruction, etc.
- 16How many bits are in a Binary number?To represent bigger whole numbers (integers), you need more bits -- more places in the binary number: 10000101 = 128 + 0 + 0 + 0 + 0 + 4 + 0 + 1 = 133. That was 8 bits: 8 bits is usually called a "byte", and it's the size usually used to represent an alphabetic character -- "A" is 65, or 01000001
- 17Know how to convert from Binary to DenaryFirst set up the columns of base 2 numbers. Then look for the highest 2n number that goes into 84. Result: 84 in denary is equivalent to 1010100 in binary. binary A number system that contains two digits, 0 and 1.
- 18Know how to convert from Denary to BinarySet up the columns of base 2 numbers.
Find the highest 2n number that goes into 84. The highest 2n number is 26 = 64.
84 – 64 = 20. ...
20 - 16 = 4. ...
4 - 4 = 0.
Mark up the columns of base 2 numbers with a 1 where the number has been the highest 2n number, or with a 0 - 19What 4 devices are needed to connect to the internet?a computer.
telephone line (cable being the exception)
modem and/or router.
an ISP (Internet Service Provider)
Web browser, eg Internet Explorer, Firefox, Chrome, Safari, Opera - 209+1021
Information
- Description
- Flashcards on Revision, created by Cody Grogan on 08/01/2018.
- Created by
- Cody Grogan
- Views
- 14
- Rating