Taking a Brief Look Inside a Computer


Inside a Computer

If you’ve used any kind of computing device before, you must sometimes wonder how it works. Have you ever looked inside a computer case, or seen pictures of the inside of one? The small parts may look complicated, but the inside of a computer case isn’t really all that mysterious. This lesson will help you master some of the basic terminology and understand a bit more about what goes on inside a computer.

computer

Photo Credit: TES

Motherboard

The motherboard is the computer’s main circuit board. It’s a thin plate that holds the CPU, memory, connectors for the hard drive and optical drives, expansion cards to control the video and audio, and connections to your computer’s ports (such as USB ports). The motherboard connects directly or indirectly to every part of the computer.

motherboard

Photo Credit: PNG All

The motherboard is a printed circuit board containing the principal components of a computer or other device, with connectors for other circuit boards to be slotted into.

CPU or Processor

The central processing unit (CPU), also called a processor, is located inside the computer case on the motherboard. It is sometimes called the brain of the computer, and its job is to carry out commands. Whenever you press a key, click the mouse, or start an application, you’re sending instructions to the CPU.

The CPU is usually a two-inch ceramic square with a silicon chip located inside. The chip is usually about the size of a thumbnail. The CPU fits into the motherboard’s CPU socket, which is covered by the heat sink, an object that absorbs heat from the CPU.

processor-cpu

Photo Credit: PCitYourself

The CPU or processor is the part of a computer in which operations are controlled and executed.

A processor’s speed is measured in megahertz (MHz), or millions of instructions per second; and gigahertz (GHz), or billions of instructions per second. A faster processor can execute instructions more quickly. However, the actual speed of the computer depends on the speed of many different components—not just the processor.

RAM (Random Access Memory)

RAM is your system’s short-term memory. Whenever your computer performs calculations, it temporarily stores the data in the RAM until it is needed.

This short-term memory disappears when the computer is turned off. If you’re working on a document, spreadsheet, or other type of file, you’ll need to save it to avoid losing it. When you save a file, the data is written to the hard drive, which acts as long-term storage.

ram-random-access-memory

Photo Credit: AndroidPIT

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.

RAM is measured in megabytes (MB) or gigabytes (GB). The more RAM you have, the more things your computer can do at the same time. If you don’t have enough RAM, you may notice that your computer is sluggish when you have several programs open. Because of this, many people add extra RAM to their computers to improve performance.

Hard Drive

The hard drive is where your software, documents, and other files are stored. The hard drive is long-term storage, which means the data is still saved even if you turn the computer off or unplug it.

hard-drive

Photo Credit: Dan’s Data

A hard drive is a non-volatile memory hardware device that permanently stores and retrieves data on a computer.

When you run a program or open a file, the computer copies some of the data from the hard drive onto the RAM. When you save a file, the data is copied back to the hard drive. The faster the hard drive, the faster your computer can start up and load programs.

Power Supply Unit

The power supply unit in a computer converts the power from the wall outlet to the type of power needed by the computer. It sends power through cables to the motherboard and other components.

power-supply-unit

Photo Credit: Tyshen Technology Co.

Warning! If you decide to open the computer case and take a look, make sure to unplug the computer first. Before touching the inside of the computer, you should touch a grounded metal object—or a metal part of the computer casing—to discharge any static buildup. Static electricity can be transmitted through the computer circuits, which can seriously damage your machine.

Confused about anything that was mentioned in the lesson? Ask a question!


3
5

Leave Your Comment