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

Steel: Properties and Characteristics

Steel: One pound of steel has more strength than one pound of most other materials. Steel is generally equally strong in tension and compression. There are many ways to use it: columns can be spaced at great distances, and long spans are possible. Steel corrodes if not protected and loses strength when exposed to fire. Steel contains iron.

Types of Steel

• Carbon Steels: 0.15–1.8% carbon (includes spring steels).
• Alloy Steels: Contain additional ingredients such as chromium; stainless steel typically contains about 12% chromium and is more rust resistant.

Tips: Higher carbon content increases hardness and can make steels more difficult to weld.

Shapes and Sections

Shapes:

• W = wide-flange
• C = channel
• S = I-section

• Unit 7

Electronic Components Guide

Basic Components

Battery

A device consisting of one or more electrochemical cells with external connections for powering electrical devices. Power supply.

Light Bulb

An electric light with a wire filament heated until it glows. The filament is enclosed in a bulb to protect it from oxidation. Load device.

Motor

An electrical machine that converts electrical energy into mechanical energy. Load device.

Buzzer

A device that makes a buzzing noise and is used for signaling. May be mechanical, electromechanical, or piezoelectric. Load device.

Semiconductor Components

Diode

Formed by the union of two semiconductors: P-type (anode) and N-type (cathode). Load device.

Light-Emitting Diode (LED)

An electronic device that emits light when... Continue reading "Electronic Components Guide: Types, Functions & Applications" »

Engineering and Construction Glossary

This glossary provides definitions for key terms used in engineering, construction, and design projects, including their Spanish translations where applicable.

Cross-section (Sección transversal)

A cross-section gives a cutaway view of the joint between two panels.

Note (Notas)

A note gives a brief description or a reference to another related drawing.

Plan (Plano)

A plan gives a view of the whole deck, from above.

Schematic (Esquemático)

A schematic gives a simplified representation of a network of air ducts.

Specification (Especificación)

A specification gives detailed written technical descriptions of a panel.

Amplified

Amplified: made greater.

Elevation (Elevación)

Elevation gives a view of all the panels, from... Continue reading "Essential Engineering & Construction Terminology" »

• Limited: kept within a particular size
• Potential: possible when the necessary conditions exist
• Excessive: more than is necessary
• Peer pressure: the influence of people who are similar age
• Disadvantaged: in a situation in which you are less likely to succeed than others
• Irritable: becoming annoyed very easily
• Expose: to remove what is covering something that is very large
• Awash: having an amount of something that is very large
• Artificial: not natural
• Upgrade: to improve something so that it is of a higher quality
• Zip a file: to reduce the size of a computer file
• Save: to make sure that a computer keeps information
• Browse the internet: to look at information on the internet
• Plug sth in: to connect a piece of electrical equipment to an electricity supply
• Sync

Graphic Design Fundamentals

Graphic design involves creating drawings to represent objects, products, or to transmit ideas, events, and messages, while considering function, cost, size, shape, quality, and environmental impact.

Understanding Drawing Scales

Scale is the relationship between the size of a drawing and the actual size of the object:

• 1:2 (Scaling down): The drawing is smaller than the real object; used for large items like houses, cars, or planes.
• 1:1 (Full scale): The drawing matches the real-life measurements; used for objects like pencil cases.
• 2:1 (Scaling up): The drawing is larger than the real object; used for small items like bacteria or viruses.

Isometric Perspective

Isometric means equal measure. It utilizes 120° and 30° angles... Continue reading "Technical Drawing Fundamentals: Scales, Dimensioning, and Views" »

Common Cyber Attack Definitions and Techniques

Vishing: Voice Phishing Attacks

Using telephone calls to commit a phishing attack.

Smishing: SMS Phishing

Using SMS (text messages) to commit a phishing attack.

Pharming and DNS Poisoning

Directs users to a fake website when they enter the URL of a genuine site.

Whaling: Targeting High-Value Individuals

A specialized type of phishing attack specifically targeting high-ranking executives, such as CEOs, via email.

Salami Slicing Technique

A financial crime where small, often undetectable amounts of money are stolen from a large number of accounts. The cumulative gain is significant, but individual victims rarely notice the loss.

Data Diddling

Altering data, typically by changing information before or during... Continue reading "Cyber Attack Definitions: Vishing, Ransomware, and Botnets" »

Understanding Computer Systems and Networking Essentials

Command-Line Interface Basics

Command-line interfaces (CLIs) are often replaced by graphical user interfaces (GUIs) and menu-driven interfaces.

Accessing the Command Prompt in Windows

To access the command prompt in Windows: Start > Programs > Accessories > Command Prompt. Alternatively, you can type cmd in the Run dialog or search bar.

Essential Computer Tools and Settings

The Windows Control Panel and System Settings offer various useful tools and configurations, typically categorized as:

• Programs
• Hardware and Sound
• User Accounts and Family Safety
• Network and Internet
• Appearance and Personalization
• System and Security

Key Windows System Utilities

• Computer Properties

  Provides basic information

STEEL

Scrap can be sorted easily using magnetism. If the metal is galvanized (coated with zinc), the zinc is fully recyclable. If it is stainless steel, other metals mixed with the iron, such as chromium and nickel, can also be recovered and recycled.

GLASS

Sorting is critical, as there are key differences between the clear and colored material used in bottles and jars, and the high-grade material used in engineering applications, which contains traces of metals.

COPPER

Scarcity makes recycling especially desirable and justifies the cost of removing insulation from electric wires, which are a major source of scrap. Pure metal can also be recovered from alloys derived from it, notably brass (which also contains quantities of zinc and often lead)... Continue reading "Benefits of Recycling Different Materials and Water Intoxication Symptoms" »