Question: The system unit of a personal computer typically contains all of the following except:

Answer:

A modem is a device used to connect a computer or other electronic devices to a network or the internet. The term "modem" is a combination of the words "modulator" and "demodulator."

The main function of a modem is to convert digital data from a computer into analog signals that can be transmitted over analog communication lines, such as telephone lines. It also performs the reverse function, converting analog signals back into digital data for the receiving computer or device.

Here is a breakdown of the components typically found in the system unit:

1. Motherboard: It is the main circuit board that connects and allows communication between different hardware components.
2. Central Processing Unit (CPU): It is the primary processing unit of the computer responsible for executing instructions and performing calculations.
3. Memory Modules: These are electronic components that store data and instructions for the CPU to access quickly. Examples include RAM (Random Access Memory) modules.
4. Storage Drives: These devices store and retrieve data in the computer. Examples include hard disk drives (HDDs), solid-state drives (SSDs), or optical drives (e.g., CD/DVD drives).
5. Power Supply: It provides electrical power to all the components within the system unit.
6. Expansion Slots: These are slots on the motherboard that allow additional cards or modules to be added to the computer, such as graphics cards, sound cards, or network cards.