Major Personal Computer Hardware Components. Used for input, output, processing, and storage, as well as components that allow communications within the computer and provide an electrical supply. Computer Case.
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Used for input, output, processing, and storage, as well as components that allow
communications within the computer and provide an electrical supply.
Most input and output devices are outside the computer case, while most processing, storage, communication, and power supply components are contained inside the computer case.
Computer cases for personal computers and notebooks fall into three major categories:
The desktop case sits horizontally on a desktop, often under a monitor. The tower case, which usually sits vertically under the desk, is
one to two feet tall. The notebook case is used for notebook computers (also referred to as laptop computers).
Many other computer components also must communicate with the CPU. In fact, each hardware input, output, or storage device requires these elements to operate:
Every device must have a way to send or receive data to and from the CPU. The CPU might need to control the device by passing instructions to it, or the device might need to request service from the CPU.
Control the Device
A device is useless without software to control it. Each device responds to a specific set of instructions based on its particular functions. The software must have an instruction for each possible action the device is expected to perform, and the software must know how to communicate with a device at the level required by the device. The CPU also must have access to this software in order to interact with the device.
Devices can receive power from the power supply inside the computer case, or they can have their own power supplied by a power cable connected to an electrical outlet.
Most input and output devices reside outside the computer case.
Input and output devices communicate with components inside the computer case through a wireless connection or through cables attached to the case at a connection called a port.
A port is a physical connector that allows a cable from a peripheral device to be attached to the computer.
A peripheral device such as a keyboard, mouse, monitor, or printer, is a device that is not located directly on the motherboard but communicates with the CPU. Peripheral devices often are connected to the computer’s motherboard via a port or wireless connection.
Most likely in front of you right now are two of the most popular input devices: the keyboard and the mouse. And instead of a mouse on a laptop computer you normally have a touchpad.
Different people prefer different input devices for doing same task. For instance, many graphic artists prefer to use a stylus and graphics tablet rather than a mouse. It might offer them a greater deal of artistic freedom, or precision while performing their work.
Sufferers of carpal tunnel syndrome often prefer a trackball or stylus to a mouse. Handicapped computer users have invented a wide array of input devices designed to replace the mouse including devices controlled by foot or even eye movement.
Not only PCs and mainframes use input devices. Almost all computers feature some kind of input device. Special scanners are used in many stores and warehouses called barcode readers to enter stock and sell items at the cashier. These are input devices as well. Even microphones can technically be called input devices as a computer can respond to them and interpret them as incoming data.
Corporations and especially government institutions are already implementing the second generation of input devices to improve security. These include retina scanners and/or fingerprint readers to replace or improve accuracy of username and password authentication. You will be seeing more of this kind of biometric authentication in the coming years as a general remedy for weak passwords or leaked passwords.
The monitor and the printer are the two most widely used output devices. The monitor visually displays the output of the computer. The monitor is described by the size of its screen in inches (measured diagonally) and the monitor’s resolution. Resolution refers to the sharpness and clearness of an image. The monitor’s resolution is a function of the number of dots, or pixels, used for display. The greater the number of pixels in an image, the higher the resolution of the image.