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The real time clock is a system clock which is set and programmed inside BIOS chip. The BIOS chip helps to store the settings of the system clock and other setting. The settings are saved with the help of 3volt DC battery which is also known as CMOS battery.

CPU means processor of computer system. Processor is a chip that is placed on motherboard which helps to compute input data. A processor is made of thousands of transistors in a minute circuit. The combination of transistors makes different units and each unit performs different functions. A processor is of 2 types- one with pin of its surface and other without pin on its surface (pinless). The one with pin on its surface is pin type processor and found in Pentium I-III. While pinless processor is found in P4 computer. According to frequency speed of processor, they are classified as…

Figure: Structure of Motherboard. Motherboard is a largest circuit board of computer which provides platform to interconnect input-output devices as well as other devices such as hard disk, CD-ROM, Processor etc. A motherboard has two major chips; north bridge and south bridge chipset. Beside these two chipset, there is another important chip known as CMOS (BIOS) chips. There is a processor socket and RAM slot with other PCI slots. The north-bridge is placed near processor socket which inter-connects RAM and processor. The south-bridge inter connects between processor and input/output devices. Depending upon types of motherboard, there are 12 pins, 20,…

Figure: Casing Structure Casing is a rectangular metallic box which provides framework for various components inside it. Various components such as motherboard, hard disk, CD-ROM, SMPS etc. are inter-connected to each other and fixed to the casing. The front side (Panel) of casing has 2 switches, power and reset keys. Similarly 2 LED, one for power and other for Hard Disk. There are other ports such as USB and audio ports in most casing of today. At the backside there is a box called SMPS, which is used to supply power. Similarly there are temporary block panels for different input/output…

Figure: Power Supply Box of Desktop Computer Computer is an electronic device which operates by using current. Computer is supplied 230 volt AC current which is converted to 110 volt DC current. Various components of computer such as Hard-Disk, CD-ROM, USB port, serial port, keyboard, mouse etc. needs current to operate. The computer has a power supply box known as SMPS (Switched Mode Power Supply) at the back-side of the casing. 230v AC current is supplied to the SMPS which again convert it to 110v DC current. The converted DC current is supplied to the motherboard and other components through…