Notes, summaries, assignments, exams, and problems for Secondary education

P–N Junction Diode Fundamentals

A p–n junction diode is constructed from a semiconductor crystal, typically silicon, although germanium and gallium arsenide are also utilized. Impurities are added to create two distinct regions. One side, called the n-type semiconductor, contains negative charge carriers (electrons). The other side, the p-type semiconductor, contains positive charge carriers (holes).

When these two materials (n-type and p-type) are joined, a momentary flow of electrons occurs from the n-side to the p-side. This results in a third region where no mobile charge carriers are present. This area is known as the depletion region due to the absence of free electrons and holes.

The diode's terminals are connected to the n-type and... Continue reading "P-N Junction Diode Construction and Biasing" »

Urban and Social Structures

• Bourgeoisie: People who lived in cities and usually worked as merchants. They receive this name because the primitive walled settlements inhabited by merchants near castles and bridges were called "boroughs" or "burgs."
• Guilds: Associations of craftsmen with the same trade.
• Fairs: Trade meetings for merchants under the protection of kings and nobles.
• Hanseatic League: Trade association formed by cities next to the Baltic Sea.
• Marco Polo: A famous merchant from Venice who reached China in the 13th century and described his journeys in his Book of the Marvels of the World.

Political and Religious Institutions

• Papacy: It comprised all the territories under the political authority of the Pope (also known as the "Papal States"

The Baroque Era

The Baroque is a stage situated between the Renaissance and Classicism. In this stage lived composers like Johann Sebastian Bach or Handel. In this stage, although they were better considered, musicians were not yet independent and belonged to a nobleman, king, or a patron.

In this stage, the most important instrument is the violin, and proof of this are the builders that appeared in Italy called Stradivarius and Guarnerius, whose instruments today reach millions in auctions. The most important cultural area is going to be Italy, which will impose that musicians who want to be important must compose in the Italian way. It is also important because the opera will be established, and secular music no longer exists as a separate... Continue reading "Key Elements of Baroque Musical Composition" »

Tyranny

Tyranny is a form of government in which the ruling power is in the hands of an individual who has seized control, often by illegal means. The word tyranny comes from the Greek word tyrannos, which means "usurper with supreme power." Over time, a person who ruled by tyranny, or a tyrant, became known for holding onto power by cruel, abusive means.

Democracy

A democracy is a form of government in which the ruling power is in the hands of all people. The word democracy comes from the Greek terms demos (meaning people) and kratos (meaning power).

Oligarchy

An oligarchy is a form of government in which the ruling power is in the hands of a few leaders. The word oligarchy comes from the Greek terms oligos (meaning few) and arkhein (meaning rule)... Continue reading "Ancient Greece and Rome: Key Terms" »

Chapter 1

Ben Norton loves superheroes and comics. He has seen all the superhero films and read all the superhero books. He is also a superhero in his town: he is Banana Boy. He has a banana costume that gives him superpowers. However, in his town, he feels like a nobody because nothing exciting ever happens. The Banana Boy costume used to be an old fancy dress costume from school. When he put the costume on, he gained superpowers, and nobody knew who he was.

It was the first day of the school holidays, and Ben wanted to save the world, but the world didn't seem to need saving. Ben dreamt that he was saving the town from giant pieces of falling fruit. People were stuck in sticky juice, strawberries fell from the sky… it was complete chaos.... Continue reading "Adventures of Banana Boy: A Superhero Tale" »

1. Causes of Colonialism

A) Political and Strategic

• Colonies were symbols of prestige.
• Control of strategic areas for security and trade.

B) Demographic

• Colonies absorbed excess European population to mitigate social conflicts and unemployment.

C) Economic

• Demand for raw materials for industry.
• Need for new markets for industrial products.
• Capitalism stimulated investment in other territories.

D) Geographical and Technical

• Scientific expeditions explored unknown areas to discover new plants, animals, and minerals.
• New means of transport facilitated exploration.

E) Cultural and Ideological

• The belief in the supremacy of white people and their duty to "civilize" inferior peoples.
• Nationalism drove the desire for large nations to rule over less "civilized" people.

Ionic Bonds

Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions. Ionic bonds form when a metal and a non-metal exchange electrons. Positive ions are called cations and negative ions are called anions.

Ionic Substances

All ionic compounds form crystals that consist of lattices of positive and negative ions packed together in a regular way. The lattice is held together by the strong electrostatic attractions between the ions. Ionic compounds form crystals because the ions are arranged in a regular and repeated pattern, known as a Giant Ionic Lattice.

Properties of Ionic Substances

• High Melting and Boiling Points: Ionic bonds are very strong. Significant energy is required to break

Calm down:                      aching muscules:

THE LABOUR MOVEMENT

EARLY LABOUR MOVEMENTS

The Industrial Revolution began in Britain, where workers first organized themselves into groups to pressure factory owners and governments. Working together in harsh conditions, workers saw the labour movement as the only way to improve their situation.

• Luddism: In the early stages of the Industrial Revolution, new technologies made skilled workers lose their jobs in the textile industry. In response, some of them destroyed factory machines. This developed into the Luddite movement.
• Chartism: The first organized labour movement with political goals. Between 1838 and 1848, this movement had millions of supporters and presented its People's Charter to the British Parliament. The movement demanded labour

The Great Depression

At the end of the 1920s, a series of problems in the USA caused a major economic crisis, known as the Great Depression. This crisis lasted until the end of the 1930s and brought an end to the prosperous, consumer lifestyle of the previous decade.

USA Crisis: Triggers of the Depression

The problems that led to the crisis in the USA included:

• Overproduction: American industry produced more goods than the population needed. When companies could not sell their products, they went bankrupt and had to close.
• Falling Consumption: When companies closed down, people lost their jobs and stopped spending money. Rising unemployment reduced demand. As a result, more and more companies went out of business.
• The Wall Street Crash: When many