Introduction Almost Everyone Uses a Computer Daily, but Many Don't
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Introduction Almost everyone uses a computer daily, but many don't know how a computer works or all the different individual pieces that make it up. In fact, many people erroneously look at a computer and call it a CPU or a hard drive, when in fact these are just two parts of a computer. When these individual components are connected together they create a complete and working device with an all encompassing name of computer. As a computer user it is important that you have a basic understanding of the core components that make up your computer. This knowledge will prove invaluable if you decide to upgrade your computer or if a piece of hardware breaks and you need to purchase a replacement. The purpose of this tutorial is to discuss the basic pieces in every computer and their function. The Outside of your Computer When you look at your computer what you are seeing is actually the computer case. Inside the case are all of the individual components that when connected together create your computer. On the outside of the case you will see various external ports that you can plug devices into as well as the ability to access your optical devices such as your CD and DVD drives. Front of a Dell Inspiron Desktop Back of a Dell Inspiron Desktop Figure 1. Front and Back of a Computer Case On the front of the computer you will commonly find a CD or DVD drive that can be opened by pressing a small button near the door of the drive. This will eject the drive tray where you can place a CD or DVD disk. When you press the button again, the tray will slide back into your computer so that you can access it from within your operating system. On the front of the case, you will also typically find USB ports and media readers. A USB port is a small opening on the front of your computer that allows you to plug a USB device or cable into it. You can usually determine if a port on your computer is USB as it will have the logo next to it. Common devices that you would plug into USB ports are iPod and iPads, flash drives, and external hard drives. The other common ports that you can find are for camera memory media. These media readers allow you to remove the memory card from your camera and insert it into the computer so you can access the images stored on it. On the back of the case are connectors that are typically only used when you assemble your computer for the first time. These connectors allow you to connect external devices such as your printer, monitor, mouse, keyboard, and speakers. The back connections will also include an Ethernet port that will allow you to connect your computer to your network. Last, but not least, there will also be more USB ports available in the event that you need more USB connections than are available on the front of your computer. The Inside of your Computer Now that you know how to connect your various external components to your computer case, let's take a look at the inside of a computer as this is where the magic really happens. To open your case, you will need to typically unscrew a side panel or press a button on the bottom of the computer to open the computer like a clamshell. Once you can see inside a computer, you will see various individual components connected via cables or plugged directly into a large board attached to the side of the case. This board is the motherboard and is used to connect all the individual devices inside your case into a single computer. These individual devices and the motherboard they plug into can be seen in the image below. Figure 2. Inside of a computer As you can see from the image above, there are various components all connected to each other. Every device must be connected to the power supply unit, which provides electricity to various components. The add-on cards, each performing their own function, are inserted to the motherboard so that they can communicate with it. When all of these components are properly connected to each other, they can then communicate with each other and the computer will operate properly. In the next section we will discuss each individual component and what function they serve. The individual parts of your computer As already stated, a computer is nothing more than various individual hardware components connected to each through cables and the motherboard. These devices are then given electricity by the power supply unit so that they can function. In this section we will discuss the individual components and the function that each performs. Computer Case The computer case, also called a chassis, houses and protects other core parts of the computer. Computer cases come in different sizes and shapes in order to accommodate the various environments that they will be stored in. These shapes are: Tower - A tower case is vertical and usually sits on the floor. A tower case comes in a mini, mid, and full size, with the larger sizes being able to hold more components. Desktop - A horizontal case that is designed to rest on a shelf or sit on your desk with the monitor on top of it. Rackmount - Rackmount cases are horizontal and are typically used for servers. These servers will then mount in a rack so that there are stacks of computers in one computer rack. HAF 932 AMD Limited Edition Full Tower iStarUSA E3M8 Rackmount Case Case Figure 3. Computer Cases Computer cases also need to support the largest component that resides inside it, which is typically the motherboard. The motherboard can come in many different shapes and sizes, called form factors, and the specifications on a computer case will state which form factors can fit inside it. Virtually all modern cases have: Power switch Indicator lights such as disk activity or network activity. Back panel that contains holes to expose external ports. Metal framework to house the PSU and hard disk/optical drives Mounting points to secure the motherboard Vented panels to allow airflow through the case Depending on the model, some cases have other features as well such as headphone jacks or USB ports. Motherboard The motherboard, or mobo for short, is perhaps the most critical piece of the computer. It is a relatively large, rectangular board filled with various circuits, chips , and slots that you plug things into The motherboard serves two functions. First, the motherboard is home to a number of chips that dictate how the various components of the computer will talk to each other. It also has special slots that allow you to plug expansion cards in that add new or improved functionality to your computer. Secondly, and perhaps most importantly, the motherboard is the connecting point for all of the other pieces of the computer. Without the motherboard, the different parts cannot communicate with each other, and the computer cannot function. Figure 4. Computer Motherboard Motherboards come in a variety of sizes, or form factors, such as ATX or microATX. Generally speaking, the larger the form factor the more devices can be attached to it. Motherboards connect with the other devices in your computer using a set of special slots and connectors called ports that are located on the top and back edge of the motherboard. The ports on the back edge of the motherboard protrude out of the back panel of the computer case and allow you to connect external devices to the computer. Virtually all modern motherboards have one or more USB ports and an Ethernet port mounted externally to allow connection to the internet and external devices. Additionally, all modern motherboards contain at least one IDE or SATA port to allow the connection of a hard drive. Central Processing Unit The central processing unit, or CPU, is at the core of every computer. Functioning as the "brain" of the computer, the CPU performs basic mathematical and logical functions as instructed by a computer program. The CPU is located on the motherboard and is connected to it through a special port called the CPU socket. When the CPU is in use it generates heats, which must be transferred away from CPU chip so that it is not damaged. This is accomplished through the use of a heat-sink and fan which draws the heat out of the CPU chip and transfers it into the case instead. Figure 5. A computer's CPU or Processor A CPU has a maximum speed at which it can safely process instructions. This speed is called the clock rate and is measured in hertz (Hz). Some CPUs will allow a user to raise the clock rate beyond the speed at which the CPU is safely rated. This is called overclocking, and can provide increased computer performance at the cost of potential system instability or damage. Due to the complexity of overclocking and the potentially destructive side effects it can cause, overclocking is a technique not recommended for average or professional computer users. A relatively recent development in the field of CPUs is the multi-core processor. Having many processing cores in the CPU effectively multiplies its potential by allowing the CPU to simultaneously process as many instructions as it has cores. However, the OS must be designed to make use of multiple cores for this ability to take effect. The CPU of a modern PC will likely have anywhere from two to eight cores Power Supply Unit All parts of a computer require electricity in order to operate.