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

The Energy of Tomorrow

Wind Power: A Solution?

It is generally accepted that we will not be able to use oil and gas to power our homes forever. These energy forms contribute to pollution, and as a result, alternative, clean energy sources will be relied on more in the future. One of the most common alternative sources is wind power, but does this solve our energy problems?

It is well known that wind energy is a clean energy source. Not only is it sustainable, but it is also cheap. Furthermore, wind turbines perform reliably and are adaptable; they are perfect for both the city and the countryside. In countries such as Spain, more than 20% of the electricity used is already generated by wind turbines.

Disadvantages of Wind Power

However, there are... Continue reading "Wind and Solar Power: The Future of Energy?" »

Alternators and Generators

1. Alternators vs. DC Generators

Alternators produce a usable voltage level at lower RPMs than DC generators because alternators have more field poles.

2. Delta Wound Three-Phase Alternator Stator

The windings wired in relation to each other in a delta-wound three-phase alternator stator are in series.

3. Generator Output

Generator output is expressed in the number of amps at rated voltage.

4. AC 43.13 Electrical System Design

The AC 43.13 suggests that the electrical system of an aircraft be designed so that when all systems are operating, no more than 80% of generator capacity can be exceeded.

5. Reverse Current Cutout Relay

The main function of a reverse current cutout relay in a generator system is preventing motoring of... Continue reading "Aircraft Electrical Systems" »

The classroom space is used properly. Everything is very well positioned, and all areas are well-utilized. The classroom is organized into distinct corners:

• Library corner
• House corner
• Building corner
• Computer corner
• Puzzles corner
• Artistic corner
• English corner

Children are responsible for keeping these corners tidy and for playing appropriately, respecting the rules in each area. When children finish playing, they collect and put away all the elements of the corner.

The teacher manages the class by directing the children's attention to pictures or objects. She speaks softly, sometimes telling them she is going to share a secret, which prompts the children to lower their voices and pay attention. She also uses rapid transitions between activities to... Continue reading "Effective Classroom Management & English Language Learning" »

WIAT-III, KTEA-3, and WJ IV: A Detailed Comparison of Achievement Tests

Reading Skills Assessment

WIAT-III: Early Reading Skills, Reading Comprehension, Word Reading (called Letter and Word Recognition on KTEA), Pseudoword Decoding (nonsense words), Oral Reading Fluency.

Comparison with KTEA-3:

• Instructions are in a book rather than on the back side of the easel.
• KTEA Age Range: 4-25
• WIAT Age Range: 4 years - 19 years 11 months

WJ IV Achievement: Letter and Word Recognition (Identify and read letters and words), Passage Comprehension (read the word(s) and identify picture/complete sentences), Word Attack (read nonsense words), Identify pictures/letters that begin with a specific sound, Sentence Reading Fluency (read the questions and circle yes or... Continue reading "WIAT-III, KTEA-3, and WJ IV Achievement Tests Compared" »

Lesson 11: Informatics and ICT

What is Informatics?

Informatics is the science that studies the techniques and automated processes that act on data and information. The word "informatics" comes from the fusion of the terms "information" and "automatic".

What is ICT?

ICT stands for Information and Communication Technology. It is classified into three groups:

1. Networks: Broadband, Television, Radio, Satellites
2. Terminals: Television, Computers, Mobile Phones, Audio Players
3. Services: Radio, Online Banks, Electronic Commerce, Messenger Services

Distinctive Features of ICT

• Immateriality: Handling a lot of information in a small space.
• Interactivity: Users can communicate practically.
• Instantaneity: Linking processes are faster.
• Innovation: Continuous update of

Unit 1: Language and Communication

Key Vocabulary

• Accent: acento
• Bilingual: bilingüe
• Cognate: cognado
• Comment on: opinar sobre
• False friend: falso amigo
• Fluently: con fluidez
• Idiom: idioma
• Keep in touch: mantenerse en contacto
• Meaning: significado
• Mother tongue: lengua maternal
• Proverb: proverbio
• Saying: dicho
• Second language: segunda lengua
• Slang: argot
• Speak in public: hablar en publico
• Spread a rumour: extender rumor
• Synonym: sinonimo
• Translation: traduccion

Internet and Social Networks

• Blogger: bloguero
• Chatroom: sala de chat
• Cookies: galletas
• Cyberbully: cyberbully
• Delete an account: eliminar cuenta
• Follower: seguidor
• Go online: navegar online
• Hacker: jaqueador
• Internet addiction: adicto a internet
• Log off: desconectarse
• Post an update: publicar actualizacion
• Post online:

New Terminology of Finite Automata

• We call the part of the FA where the input string resides while it is being run the Input Tape.
• The Input Tape must be long enough for any possible input. Since any word in a* is a possible input, the Tape must be infinitely long.
• The Tape has a first location for the first letter of the input, then a second location, and so on.
• Therefore, we say that the Tape is infinite in only one direction.

A New Format for FAs

• The locations into which we put the input letters are called cells. (See the table below)
• Name the cells with lowercase Roman numerals.

• The Δ is used to indicate the blank.
• Input string is aab.
• Input tape parsing.
• As the Tape is processed on the machine, we read one letter at a time and eliminate each

A Circuit

A circuit is an unbroken loop of conductive material that allows electrons to flow through continuously without beginning or end. If a circuit is ”broken,” that means its conductive elements no longer form a complete path, and continuous electron flow cannot occur in it. The location of a break in a circuit is irrelevant to its inability to sustain continuous electron flow. Any break anywhere in a circuit prevents electron flow throughout the circuit.

A Fuse

A fuse element acts as a sacrificial device to provide overcurrent protection. Most fuses include a metal wire or strip that melts when too much current flows, which interrupts the circuit in which it is connected.

Electromotive Force (EMF)

To move electrons in a conductor in a... Continue reading "Fundamentals of Electronics: Circuits, Components, and Arduino" »

1. Electric Circuits

An electric circuit is a route around which electrons circulate. It consists of a generator, a cable, a switch, and a receiver. Electric current is the flow of electrons around a circuit. We need a generator to maintain the current.

Types of Materials

• Conductors: Allow electric currents to pass through them (e.g., metals).
• Insulators: Don't allow electric current to pass through them (e.g., plastics).
• Semiconductors: Have properties between conductors and insulators (e.g., silicon and germanium).

Electrical Resistance

The electrical resistance of a material is a measure of the degree to which the material opposes an electric current flowing through it.

• Metals have hardly any electrical resistance; insulators have very high levels

Analyzing Two Classroom Learning Activities

Learning Purpose

The relevance of these games will depend on your purpose. Both seem suitable for revision or practice of instructions.

• Activity A involves counting and receptive language skills (reading and listening). It can also involve speaking if the teacher gets children to comment on what they are going to do.
• Activity B involves listening and speaking, specifically giving and following instructions.

Learners

Both activities seem suitable for younger learners as they are simple to understand and carry out.

• Activity A requires children to be able to count up to six, so it may not be suitable for very young learners (5 and under). It is more demanding linguistically in terms of receptive skills (reading