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

Sort by
Subject
Level

Understanding Electricity and Electronics: DC and AC

Classified in Technology

Written on in English with a size of 2.92 KB

Understanding Electricity and Electronics

Electricity

Matter is formed by atoms consisting of negatively charged particles (electrons) and positively charged particles (protons). Between these particles, there are forces of attraction or repulsion that generate a type of energy called electricity.

In a balanced atom, the number of protons is equal to the number of electrons. The forces of attraction and repulsion between these particles are balanced. When this balance is disturbed, the electrical forces become unbalanced and the electrons are driven by their electrical energy to other atoms in search of new balances.

We call this transfer of charges electrical current, and it is produced in conducting materials.

Conducting materials transmit electrical... Continue reading "Understanding Electricity and Electronics: DC and AC" »

Karma: 6%
Visits: 0

Search Engine Mechanics: Crawling, Indexing, and Ranking

Classified in Technology

Written on in English with a size of 3.61 KB

Search Engine Functions: Crawling, Indexing, Publishing

Crawling

The process by which search engine robots (also known as spiders or web crawlers) discover new and updated web pages and add them to the search engine index. They achieve this by performing an algorithmic scan to determine which pages to crawl, then follow links to interconnect content across the web.

Indexing

Once a document or web page is located, it is processed and stored in a vast database, making it available for user retrieval. Search engines maintain large data centers where their robots process all the pages and information gathered during crawling.

Serving Search Results

The primary goal of search engines is to provide an almost immediate and relevant answer to the user's... Continue reading "Search Engine Mechanics: Crawling, Indexing, and Ranking" »
Karma: 6%
Visits: 0

Mechanical Principles and Tool Applications Explained

Classified in Technology

Written on in English with a size of 3.57 KB

Mechanical Tool Usage Facts

A torque wrench is used to tighten a bolt when: The exact amount of force on the bolt has to be measured.

Taps and Dies Function

Taps and dies are tools used to: Cut threads for nuts and bolts.

Metal Pattern Creation

The type of pattern made on metal is created by a process called: Knurling.

Nail Sizing System

Which of the following uses a penny system to specify its size? Finishing nail.

Chimney Leak Prevention

What is placed around a chimney to prevent leaks? Flashing.

Sheet Metal Bending

Which tool is used to bend large sections of sheet metal? Brake.

Fastening to Sheet Metal

Self-tapping screws are primarily used when fastening objects to: Sheet metal.

Concrete Reinforcement

Anchor bolts are used to hold the: Rebar to the concrete.

... Continue reading "Mechanical Principles and Tool Applications Explained" »

Karma: 6%
Visits: 0

Understanding Gears: Types, Mechanisms, and Applications

Classified in Technology

Written on in English with a size of 3.04 KB

What are Gears?

Gears are mechanical elements designed to transmit turning movements.

Characteristics of Gears

Two main characteristics define a gear:

  1. Number of Teeth (Z): This characteristic represents the number of teeth on a gear.
  2. Rotational Speed (N): This characteristic represents how fast a gear rotates.

Gear Ratios and Speed Control

Different Number of Teeth

Using gears with different numbers of teeth allows us to modify a machine's rotational speed. If the output gear is larger than the motor gear, it will rotate slower. Conversely, if the output gear is smaller, it will rotate faster.

Same Number of Teeth

If two gears have the same number of teeth, they will rotate at the same speed.

Motor Gear vs. Output Gear

In a gear pair:

  • The motor gear initiates
... Continue reading "Understanding Gears: Types, Mechanisms, and Applications" »
Karma: 6%
Visits: 0

Essential Hand Tools for Electricians and Their Uses

Classified in Technology

Written on in English with a size of 2.91 KB

Pliars: The plier is a hand tool. It is my favorite tool. It is very useful for many kinds of different jobs; for example, it is useful for electricians. It is made of metal, plastic, steel, and other materials. It has a plastic handle, which is insulating. It is used for picking up objects and cutting wire; also, this tool is used for tightening wires. There are many kinds of pliers, like needle nose pliers, clamping pliers, lineman pliers, and side-cutting pliers.

Cutting Tools: It has a special insulating plastic handle and a steel blade. It is made of a lot of different colors. There are many kinds of cutting tools like cutters, electrician scissors, wire strippers, and hacksaws. These tools are very dangerous because they can cut your hands... Continue reading "Essential Hand Tools for Electricians and Their Uses" »

Karma: 6%
Visits: 0

Java List Implementation with Search, Insert, and Remove

Classified in Technology

Written on in English with a size of 2.3 KB

Java List Implementation

Class Definition

public class Lista { 
    private Object[] item;
    private int primeiro, ultimo, pos;

    public Lista(int maxTam) {
        this.item = new Object[maxTam];
        this.pos = -1;
        this.primeiro = 0;
        this.ultimo = this.primeiro;
    }
}

Search Method

public Object pesquisa(Object chave) {
    if (this.vazia() || chave == null) {
        return null;
    }
    for (int p = 0; p < this.ultimo; p++) {
        if (this.item[p].equals(chave)) {
            return this.item[p];
        }
    }
    return null;
}

Insert Method

public void insere(Object x) {
    if (this.ultimo >= this.item.length) {
        throw new Exception("Error: List is full");
    } else {
        this.item[this.ultimo]
... Continue reading "Java List Implementation with Search, Insert, and Remove" »
Karma: 6%
Visits: 0

Primary and Secondary Memory: RAM, ROM, and More

Classified in Technology

Written on in English with a size of 3.12 KB

Primary Memory (Main Memory)

Primary memory holds only the data and instructions on which the computer is currently working. It is generally made up of semiconductor devices. These memories are not as fast as registers. The data and instructions required to be processed reside in the main memory. It is divided into two subcategories: RAM and ROM.

Characteristics of Main Memory:

  • These are semiconductor memories.
  • It is known as the main memory.
  • It is the working memory of the computer.
  • It is faster than secondary memories.
  • A computer cannot run without primary memory.

RAM (Random Access Memory)

RAM (Random Access Memory) is the internal memory of the CPU for storing data, programs, and program results. It is a read/write memory that stores data until... Continue reading "Primary and Secondary Memory: RAM, ROM, and More" »

Karma: 6%
Visits: 0

Detailed Fastening and Window Systems for Stone Wall Cladding

Classified in Technology

Written on in English with a size of 5.57 KB

Fibreboard. 1:50

Dimensiones paneles (general 120x150x0.8). Tornillos a 8cm (menos en la unión dos paneles que es a 4cm) del margen y entre ellos 28 en horizontal y 16 en vertical. Railes de unión de paneles ancho 10 raíl interior de panel ancho 5. General Fastening detail side view. Continuous T 80/100 mm alumninium profile with a thickness of 2mm. Fastened to the L 50/100 spacer (penetra 10cm en muro). Plaster thermal insulation wall plug (penetra 10cm) Ventilated gap 0.8cm thickness board + 19.5cm hasta mortero de limpieza (1cm). 0.8+4+10+5+0.5 General Fastening detail top view. En T tornilllos distribuidos 4+0.8+4. Alu profile (V-profile 0.6mm) para sostener superiormente el panel. Window detail side view. 2layers of mineral wool termal... Continue reading "Detailed Fastening and Window Systems for Stone Wall Cladding" »

Karma: 6%
Visits: 0

Computer Crime and Software Sabotage: Risks and Prevention

Classified in Technology

Written on in English with a size of 4.87 KB

Computer Crime

Any illegal or unauthorized behavior in connection with computers and computer networks. Examples of computer crime include:

  • Computer sabotage
  • Unauthorized access
  • Computer forgery
  • Damage to computer data or programs
  • Computer fraud
  • Computer espionage
  • Unauthorized use of a computer
  • Unauthorized use of a protected computer program
  • Hacking

Software Sabotage

Viruses and other invaders. Also sabotage of hardware or software. Modern computers saboteurs commonly use software. The name given to the saboteurs destructive programs are: Viruses, Worms and Trojan horses. They mimic the behavior of living organisms.

Trojan Horse

Is a program that performs a useful task while at the same time carrying out some secret destructive act. Software hides an enemy... Continue reading "Computer Crime and Software Sabotage: Risks and Prevention" »

Karma: 6%
Visits: 0

Electrical Safety and Installation Certification Guidelines

Classified in Technology

Written on in English with a size of 8.57 KB

Job Hunting

Job hunting is a synonym expression for job search. Seila lives in a beautiful seaside village, but she was born very far from the sea. She spent her childhood in a small town in the Pyrenees, where she had lots of friends. When Seila grew up, her parents sent her abroad, to Dublin, to learn about the Irish culture. There, while Seila was studying, she decided to stay a long period of time in Ireland, and in an Irish village is where Seila is now. How do we read the symbol @ when we write an email address? At. Give a synonym for junk mail. Spam. How do we call the list of telephone subscribers and their telephone numbers? Directory. How do we call the place where we get new emails? Inbox. What's the synonym for the bold expression?... Continue reading "Electrical Safety and Installation Certification Guidelines" »

Karma: 6%
Visits: 0