Notes, summaries, assignments, exams, and problems for Technology

Rolling Mill Configurations

Rolling mills are categorized by the arrangement of their cylinders. Common configurations include:

• Duo: These consist of two horizontal axis cylinders. They can be reversible or non-reversible, depending on whether the rotation direction of the cylinders can be changed to allow processing in both directions.
• Trio: This setup features three horizontal axis cylinders placed in the same vertical plane. The cylinders may have the same diameter with movements synchronized by gears, or a smaller middle cylinder may turn via friction with the two geared outer cylinders.
• Duo Alternate: In these cases, one of the cylinders is replaced by a trio train shaft.
• Double Duo: This configuration consists of two boxes, each containing

Computer Case Types

Barebone: A small-sized case designed to occupy minimal space.

Minitor: A compact case.

Bench: Similar to the Minitor, but placed horizontally on the desktop. These were once common but are now largely obsolete, except in school computer labs. It's typically placed under the monitor.

Half Tower or Semitorre: A case that's larger than the previous types, allowing for more devices to be installed.

Tower: The largest type of case, offering ample space for numerous components. It's used when significant expansion is required.

Server: These cases often have a wider frame and prioritize functionality over aesthetics, as they are commonly found in data processing centers. Their design focuses on performance and ventilation.

Rack: A dedicated... Continue reading "Computer Case Types and Hard Drive Components Explained" »

1 Definition

Electricity: It's the science that studies the movement of the electrons.

 The electrons have energy. Electricity is a form of energy that moves quickly. It's a very useful way to transport energy far from its origin. (From power station to the city).

                Electronic: It's a branch of technology that studies the uses of electricity to transmit information.

Electrical circuit: It’s the path where the electrons move to change the kind of energy.

Current: is the movement of electrons along a conductor. The electrons jump from one atom to another. When there are more atoms moving the current is more intense.

Electric tension difference

Electric tension is the difference in electrical potential between two points

Local Network Wiring

• Coaxial Cabling: A cable consisting of a central conductor wire, shielded from external electric currents by a copper mesh (now largely in disuse).
• UTP Cabling: This cable is made up of four pairs of wires within the same sheath; every pair is twisted to avoid electrical interference from other pairs.
• Fiber Optic Cabling: Carries light pulses through tiny glass fibers, making it immune to external electric currents. It consists of two strands of fiberglass.

Connection via Telephone Line

There are several ways to connect to the internet through a phone line, each requiring a specific device:

• Modems: Send or receive information through a conventional telephone line. Their mission is to convert the digital signal from the computer

Windows Server 2008 Backup Methods

Windows 2008 allows five types of backups:

• Normal Backup: A normal backup is a full backup of all selected files and directories. This process deletes the modified bit (archive bit) of each file copied.
• Incremental Backup: During an incremental backup, the program examines the modified bit and performs a backup only of files that have changed since the last incremental or normal backup. As with the normal backup, this task clears the bits of each modified file that was copied. This type of backup minimizes the time and space needed to save data by storing only changed files. However, if you need to restore files after a disaster, you must have all previous tapes available up to the first normal copy.
• Differential

Fundamental Electrical Signal Parameters

• Cycle: A part of the signal that is repeated.
• Period (T): The time, measured in seconds, that one cycle lasts.
• Frequency (f): The number of cycles repeated per second (Hertz).
• Instantaneous Value: The value of the signal at any given moment.
• Maximum Value (V_max): The greatest signal value within a period (Peak Value).
• Minimum Value (V_min): The smallest signal value within a period (Trough Value).
• Effective Value (V_eff or RMS): The value of an equivalent continuous current that produces the same electrical work. V_eff = V_max / √2

Active and Passive Electronic Components

Active Components

These components are able to generate, modify, or amplify an electrical signal.

Passive Components

Acting as loads, these components... Continue reading "AC Signal Parameters and Core Electronic Components" »