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CHAPTER 7: INPUT AND OUTPUT

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CHAPTER 7: INPUT AND OUTPUT WHAT IS INPUT Input is any data and instructions entered into the memory of a computer. Keyboards A keyboard is an input device that contains keys users press to enter data and instructions into a computer or mobile device Most desktop computer keyboards have… Typing area function keys Toggle keys Directional keys Media control buttons Internet control button An ergonomic keyboard has a design that reduces the chance of repetitive strain injuries Ergonomics incorporates comfort, efficiency, and safety into the design of the workplace Pointing Devices A mouse is a pointing device that fits under the palm of your hand comfortably Optical mouse, laser mouse, and touch mouse Touch Screens A touch screen is a touch-sensitive display device Pen Input With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections A graphics tablet, also called a digit...
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CHAPTER 8 AND 9

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CHAPTER 8 :STORAGE A storage device is the hardware that records and/or retrieves items to and from storage media Capacity is the number of bytes a storage medium can hold. Items on a storage medium remain intact even when you turn off a computer or mobile device Access time measures: The amount of time it takes a storage device to locate an item on a storage medium The time required to deliver an item from memory to the processor Hard Disks A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information Hard disks can store data using longitudinal recording or perpendicular recording Characteristics of a hard disk include: A head crash occurs when a read/write head touches the surface of a platter Always keep a backup of your hard disk An external hard disk is a separate freestanding storage device that connects with a cable to a USB port or other po...
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CHAPTER 6: INSIDE COMPUTER AND MOBILE DEVICES

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CHAPTER 6: INSIDE COMPUTER AND MOBILE DEVICES Inside the Case The case contains and protects the electronics of the computer or mobile device from damage The motherboard is the main circuit board of the computer -A computer chip contains integrated circuirt Laptop motherboard Desktop motherboard Processors The processor, also called the central processing unit (CPU), interprets and carries out the basic instructions that operate a computer Contain a control unit and an arithmetic logic unit (ALU) A multi-core processor is a single chip with two or more separate processor cores The control unit is the component of the processor that directs and coordinates most of the operations in the computer The arithmetic logic unit (ALU) performs arithmetic, comparison, and other operations For every instruction, a processor repeats a set of four basic operations, which consist of a machine cycle The le...
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