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Licenciamento em educação
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2) Apresenta ferramentas da Creative Commons para escolher uma licença e pesquisar ativos digitais com licença Creative Commons.
3) Fornece exemplos de como pesquisar recursos educacionais em sites como Flickr, YouTube, Delicious usando filtros de Creative Commons.
Folha Dominical - 16.12.12 Nº 453
I. Este documento resume as atividades e intenções de oração das três paróquias de S. Paio de Moselos, Sta Marinha de Padornelo e S. Pedro de Parada para a terceira semana de Advento.
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This document provides an introduction to fundamental electrical concepts. It explains that visible matter is made up of compounds which are composed of atoms containing protons, electrons, and neutrons. Atoms can combine to form solids, liquids, or gases. The nucleus of an atom contains protons and neutrons, while electrons orbit the nucleus. Electricity is the flow of electrons generated through friction, pressure, heat, light, chemical reactions, or magnetism. Ohm's law defines the relationship between voltage, current, and resistance in a circuit.
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The document provides an overview of basic electrical theory, including:
1) Electricity is generated by the flow of electrons, which can flow through conductors but not insulators. Common conductors are metals which contain "free electrons".
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2) Kirchhoff's laws including Kirchhoff's voltage law (KVL) and Kirchhoff's current law (KCL) are reviewed and applied to example circuits.
3) Impedance, transfer functions, and frequency response plots (Bode plots) are discussed as ways to characterize and analyze AC circuits.
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1) Circuit elements such as resistors, capacitors, and inductors are introduced along with their i-v characteristics and connections in series and parallel.
2) Kirchhoff's laws including Kirchhoff's voltage law (KVL) and Kirchhoff's current law (KCL) are reviewed and applied to example circuits.
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1) Standards for emissions from diesel buses over time, with BS VI standards going into effect in 2020 requiring a hundredfold improvement in particulate matter and NOx emissions.
2) Options for electric buses, including fully electric buses, hybrids, and trolleybuses with various charging methods like overnight charging and opportunity charging.
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The document is a physics textbook section about forces and their effects. It contains multiple pages explaining key concepts such as what forces are, how balanced and unbalanced forces affect motion, the different types of forces like friction and gravity, and the difference between mass and weight. Diagrams and activities are provided to illustrate these concepts.
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7 j electrical circuits (boardworks)
This document is from a KS3 Physics textbook. It provides information on electrical circuits, including introducing series and parallel circuits. Key points covered include:
- Series circuits have components connected in a single loop so the current is the same throughout. The voltage splits between components.
- Parallel circuits have multiple paths so the current can split and join at junctions. The voltage is the same across each part.
- Energy from batteries is transferred through electrical circuits and converted to other forms like light and heat in bulbs. The total energy transferred equals the chemical energy lost from the battery.
Basic Electrical Theory Bitter
The document provides an overview of basic electrical theory, including:
1) Electricity is generated by the flow of electrons, which can flow through conductors but not insulators. Common conductors are metals which contain "free electrons".
2) Generators use magnets to push electrons through wires, creating a flow of electrons called current that can be measured in amps.
3) Electrical circuits require a voltage source to push electrons through a conducting wire from the negative terminal to the positive terminal, powering devices called loads along the way.
Supercapacitors
Supercapacitors offer a promising alternative approach to meeting the increasing power demands of energy storage systems and electronic devices. With their high power density, ability to perform in extreme temperatures, and millions of charge-recharge cycle capabilities, supercapacitors can increase circuit performance and prolong the life of batteries. This can add value to the end-product and ultimately reduce the costs to the customer by reducing the amount of batteries needed and the frequency of the replacement of the batteries, which adds greatly to the environmental friendliness of the end-product as well.
Power systems voltage and power control
This document discusses voltage and reactive power control methods in power systems. It covers the need for reactive power to maintain voltage levels and deliver active power through transmission lines. Various reactive power compensation devices are described such as series and shunt capacitors/reactors, synchronous condensers, static VAR compensators, and static synchronous compensators. Common voltage and reactive power control methods include excitation control at generating stations, using tap changing transformers, and switching shunt reactors/capacitors depending on load levels.
Electric drives
The document provides an introduction to electric drives. It discusses that drives are used for motion control and require prime movers, with electric drives using electric motors as prime movers. About 50% of electrical energy is used for drives, which can be fixed or variable speed. Modern electric drives use power electronic converters to be small, efficient, and flexible compared to conventional drives. Electric drives have components like motors, power sources, power processors, control units, and sensors. AC and DC drives are overviewed and the use of different motor types in drives is explained.
Module 1 ELECTRONICS
This document provides an overview and review of key concepts in electronics circuits, including:
1) Circuit elements such as resistors, capacitors, and inductors are introduced along with their i-v characteristics and connections in series and parallel.
2) Kirchhoff's laws including Kirchhoff's voltage law (KVL) and Kirchhoff's current law (KCL) are reviewed and applied to example circuits.
3) Impedance, transfer functions, and frequency response plots (Bode plots) are discussed as ways to characterize and analyze AC circuits.
Modern electric trends in electric drives
Modern electric drives use traction motors powered by multi-stage converters to provide torque for vehicles like trains and elevators. Traction motors require high starting torque, ability to handle overloads, and withstand voltage fluctuations. Recent trends include multi-stage converters that generate near-sinusoidal voltages using fewer switches at lower frequencies than traditional converters. This improves efficiency and reduces harmonic losses and electromagnetic interference. Modular multi-level converters allow continuous current flow in all switches.
Electric drives
This document provides an introduction to electric drives. It discusses how electric drives use electric motors as prime movers to control motion. Approximately 50% of electrical energy is used for drives, with 75% used for constant speed applications and 25% for variable speed. The document outlines the components of electric drives and compares AC and DC motors. It also provides an overview of the classification and elementary principles of AC induction motor drives.
Module 1
This document provides an overview and review of key concepts in electronics circuits, including:
1) Circuit elements such as resistors, capacitors, and inductors are introduced along with their i-v characteristics and connections in series and parallel.
2) Kirchhoff's laws including Kirchhoff's voltage law (KVL) and Kirchhoff's current law (KCL) are reviewed and applied to example circuits.
3) Impedance, transfer functions, and frequency response plots (Bode plots) are discussed as ways to characterize and analyze AC circuits.