Electricity is the flow of electric charge. It is created by an imbalance of electric charges between objects. There are three main properties of electricity: current, which is the flow of electrons; voltage, which is the difference in electric potential; and resistance, which prevents the flow of electrons. Ohm's law states that voltage equals current times resistance. Electricity is generated by moving a coil of wire through a magnetic field or vice versa, inducing a current. It is transmitted at high voltages to reduce energy loss, then transformed to lower voltages for consumer use.
An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region. In electric circuits this charge is often carried by electrons moving through a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionized gas (plasma).
As charges are of two types, positive and negative, there are other certain basic properties they follow. If the size of charged bodies is so small, we consider them as point charges. Copy the link given below and paste it in new browser window to get more information on Basic Properties of Electric Charge www.askiitians.com/iit-jee-electrostatics/basic-properties-of-electric-charge/
An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region. In electric circuits this charge is often carried by electrons moving through a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionized gas (plasma).
As charges are of two types, positive and negative, there are other certain basic properties they follow. If the size of charged bodies is so small, we consider them as point charges. Copy the link given below and paste it in new browser window to get more information on Basic Properties of Electric Charge www.askiitians.com/iit-jee-electrostatics/basic-properties-of-electric-charge/
Electric Charge and Electric Field LectureFroyd Wess
More: http://www.pinoybix.org
Lesson Objectives:
Static Electricity; Electric Charge and Its Conservation
Electric Charge in the Atom
Insulators and Conductors
Induced Charge; the Electroscope
Coulomb’s Law
Solving Problems Involving Coulomb’s Law and Vectors
The Electric Field
Field Lines
Electric Fields and Conductors
Gauss’s Law
Electric Forces in Molecular Biology: DNA Structure and Replication
Photocopy Machines and Computer Printers Use Electrostatics
Since classical physics, it has been known that some materials, such as amber, attract lightweight particles after rubbing. The Greek word for amber, ήλεκτρον, or electron, was the source of the word 'electricity'. Electrostatic phenomena arise from the forces that electric charges exert on each other. Such forces are described by Coulomb's law. Even though electrostatically induced forces seem to be rather weak, some electrostatic forces such as the one between an electron and a proton, that together make up a hydrogen atom, is about 36 orders of magnitude stronger than the gravitational force acting between them.
There are many examples of electrostatic phenomena, from those as simple as the attraction of the plastic wrap to one's hand after it is removed from a package to the apparently spontaneous explosion of grain silos, the damage of electronic components during manufacturing, and photocopier & laser printer operation. Electrostatics involves the buildup of charge on the surface of objects due to contact with other surfaces. Although charge exchange happens whenever any two surfaces contact and separate, the effects of charge exchange are usually only noticed when at least one of the surfaces has a high resistance to electrical flow. This is because the charges that transfer are trapped there for a time long enough for their effects to be observed. These charges then remain on the object until they either bleed off to ground or are quickly neutralized by a discharge: e.g., the familiar phenomenon of a static "shock" is caused by the neutralization of charge built up in the body from contact with insulated surfaces.
Electric Charge and Electric Field LectureFroyd Wess
More: http://www.pinoybix.org
Lesson Objectives:
Static Electricity; Electric Charge and Its Conservation
Electric Charge in the Atom
Insulators and Conductors
Induced Charge; the Electroscope
Coulomb’s Law
Solving Problems Involving Coulomb’s Law and Vectors
The Electric Field
Field Lines
Electric Fields and Conductors
Gauss’s Law
Electric Forces in Molecular Biology: DNA Structure and Replication
Photocopy Machines and Computer Printers Use Electrostatics
Since classical physics, it has been known that some materials, such as amber, attract lightweight particles after rubbing. The Greek word for amber, ήλεκτρον, or electron, was the source of the word 'electricity'. Electrostatic phenomena arise from the forces that electric charges exert on each other. Such forces are described by Coulomb's law. Even though electrostatically induced forces seem to be rather weak, some electrostatic forces such as the one between an electron and a proton, that together make up a hydrogen atom, is about 36 orders of magnitude stronger than the gravitational force acting between them.
There are many examples of electrostatic phenomena, from those as simple as the attraction of the plastic wrap to one's hand after it is removed from a package to the apparently spontaneous explosion of grain silos, the damage of electronic components during manufacturing, and photocopier & laser printer operation. Electrostatics involves the buildup of charge on the surface of objects due to contact with other surfaces. Although charge exchange happens whenever any two surfaces contact and separate, the effects of charge exchange are usually only noticed when at least one of the surfaces has a high resistance to electrical flow. This is because the charges that transfer are trapped there for a time long enough for their effects to be observed. These charges then remain on the object until they either bleed off to ground or are quickly neutralized by a discharge: e.g., the familiar phenomenon of a static "shock" is caused by the neutralization of charge built up in the body from contact with insulated surfaces.
Enumerates and describes the motor development of a child in each age and the milestones for each stage. It also presents the principles of motor development. Along with it, is Gesell's Theory of Maturation.
Transformers are static devices, totally enclosed and generally oil immersed. Therefore, chances of faults occurring on them are very rare. But when fault occurring , It is very harmful for power system and our environment. So there are many protection system keep in back-up protection of power system safety.
This Ppt exlains how protect an induction motor from single phasing and over temperature. It also provides a protection system is very important in industries, using lot of motors such that production is not hampered owing to failure of any motor.
Edgefxkits.com has a wide range of electronic projects ideas that are primarily helpful for ECE, EEE and EIE students and the ideas can be applied for real life purposes as well.
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Practical Motor Protection, Control and Maintenance TechnologiesLiving Online
It is estimated that electrical drives and other rotating equipment consume about 50% of the total electrical energy consumed in the world today (and this figure increases to 70% if you only consider industry). The cost of maintaining electrical motors can be a significant amount in the budget item of manufacturing and mining industries. This workshop gives you a thorough understanding of electrical motor’s protection, control and maintenance and gives you the tools to maintain and troubleshoot electrical motors.
You will gain a fundamental understanding of the protection, control and maintenance of electric motors and drives. Typical applications of electric motors in mining, manufacturing, materials handling and process control are covered in detail. The concluding section of the workshop gives you the fundamental tools in troubleshooting motors confidently and effectively.
MORE INFORMATION: http://www.idc-online.com/content/practical-motor-protection-control-and-maintenance-technologies-49
The following topics are covered: components of power distribution systems, fuses, padmounted transformers, pole mounted transformers, vault installed transformers, transformer stations protection, transformer connections, thermometers, pressure relief devices, restricted ground faults, differential protection current transformers connections, overexcitation, inrush current, percentage differential relays, gas relays, characteristics of CTs.
this ppt was created by me and i hope it helps to all of you out there. peace
objective : school projects
personal reference
teachers reference
i know its a bit lengthy but im 100% sure it will be helpful
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Current and Electricity for class 10.pdfJackHassan2
Download our comprehensive Class 10 Current and Electricity PDF guide to master the fundamentals of electrical circuits, current flow, and key concepts in this critical science topic. This PDF provides clear explanations, diagrams, and practice questions to enhance your understanding and preparation. Covering the essential curriculum, it's an invaluable resource for students aiming for excellence in their science studies.
Current and Electricity for class 10.pdfJackHassan2
Download our comprehensive Class 10 Current and Electricity PDF guide to master the fundamentals of electrical circuits, current flow, and key concepts in this critical science topic. This PDF provides clear explanations, diagrams, and practice questions to enhance your understanding and preparation. Covering the essential curriculum, it's an invaluable resource for students aiming for excellence in their science studies.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
TESDA TM1 REVIEWER FOR NATIONAL ASSESSMENT WRITTEN AND ORAL QUESTIONS WITH A...
Electricity fundamentals
1. ELECTRICITY FUNDAMENTALS
Electricity is an apparent force in nature that exists
whenever there is a net electrical charge between any two
objects.
Basics of Electrostatics:
Electrical charges are either negative (electrons) or
positive (protons)
The unit of charge, q , is called the coloumb.
When there are equal numbers of positive and negative
charges there is no electrical force as there is no net
charge. This is the case for a neutral atom.
Electrical force is created when electrons are
transferred from one material to another (e.g. rubbing a
wool cloth with a plastic comb).
Electrical charge is conserved; charge is neither created
nor destroyed
Properties of Electricity:
CURRENT: denoted by I and measured in amperes.
Current flows from negatively charged material to
positively charged material and is essentially the
number of electrons per second that are carried
through a conductor. Current is measured in units of
amps. 1 amp = 1 coloumb/sec = 6.2 x 1018
electrons per
second!
VOLTAGE: Potential difference between a negatively
charged object and a positively charged one (like two
terminals on a battery). Potential difference is measured
2. in units of Volts ( V )which represents the work done
per unit charge to move electrons between the positive
and negative terminals. If a potential difference exists,
then energy can be extracted.
Imagine that you have two opposite charges that you
want to separate. It takes work to separate the charge
and thus the separated charges store energy. The
amount of stored energy is given by:
E = qV where V is the voltage or electric potential of
some system.
The units of voltage or Volts: 1 Volt = 1 Joule/Coulomb
If the separated charges get back together, work/energy
can be extracted from the system. If there is some
pathway for the charges to flow then we get a current.
Current is denoted by I and is in units of amperes or
amps 1 Ampere = 1 coulomb/second
RESISTANCE: Property of material that helps prevent
the flow of electrons in it. Metals are good conductors
due to low resistance. Wood is a poor conductor due to
high resistance. Resistance, R , is measured in ohms and
depends upon both the type of material and its size.
Long wires have more resistance than short wires; thin
wires have more resistance than thick wires. R is also
temperature dependent.
OHM's LAW
3. Is there a relation between I, V, and R ? Let's do an
experiment:
In the above circuit there is a battery (V), some resistors (R),
and a light bulb that can only be activated if the right
number of amps reach it. We can control this buy putting
the right resistance in the circuit for a given battery Voltage.
Experimental results then lead to Ohms law:
V = R * I
This is a linear relation. If you double the voltage (V) then
for the same value of R you get twice the current. If you
want to keep the current the same value after doubling V,
you would have to double the resistance (R).
Example:
Standard US household voltage is 120 Volts.
The heating element in your toaster has R = 15 ohms.
What is the current flowing through your toaster?
I = V/R = 120/15 = 8 amps
Your electricity bill essentially measures the amount of
current that you use but you use this current as Power .
Power = V * I
4. So the toaster has a power of 120x8 = 960 Watts.
Energy = Power * Time (and its energy --> kilowatt hours
that you pay for - a 100 watt light bulb left on 10 hours = 1
kilowatt hour. )
If you leave your toaster on for one hour, than that would
also be approximately 1 KWH (960 watt-hours if you want
to nit pick).
1000 Watt-hours = 1 Kilowatt hour (KWH); A KWH will
be our basic unit of energy in this class. You purchase
KWHs from the electric utility whenever you use power in
your home.
The Discovery of Electricy and Magnetism and the
Generation of Electricity.
In the early 19th century the following similarity between
two charged particles and two magnets was observed:
both created "forces" that could operate in a vacuum
charge had a postive and negative component; magnets
had a north and south pole force could then be either
attractive or repulsive.
both the magnetic force and the electrostatic force
strength decreased as 1/R2
5. In 1820 Oersted did this experiment:
and discovered that an electric current creates a magnetic
field
Similarly, a coil of wire with a current passing through it
generates a magnetic field. This is known as an
electromagnet or solenoid .
So now we know that a current can create a magnetic field.
If a magnetic field can create a current then we have a
means of generating electricity. Experiments showed that a
magnetic just sitting next to a wire produced no current flow
through that wire. However, if the magnet is moving a
current is induced in the wire. The faster the magnet moves,
the greater the induced current.
This is the principal behind simple electric generators in
which a wire loop is rotated between to stationary magnetics.
This produces a continuously varying voltage which in turn
produces an alternating current .
Diagram of a simple electric generator:
In this position there is no current flow but their is a large potential
difference (a large voltage)
In this position the Voltage is now zero and the current flow is at a
maximum
To generate electricty then, all we really want to do is have
some (mechanical) mechanism turn a crank that rotates a
6. loop of wire between stationary magnets. The faster we can
get this crank turned, the more current we can generate.
Popular Methods of Turning the Crank:
Let water fall on it (Hydro Power)
Direct a nozzle of steam at it (Coal or Nuclear Fired
Steam Plant)
Let the wind turn it (windmill)
Why do transmission lines carry such high voltages?
Consider the following:
Electricity is generated at the generating plant at 120
Volts and then delivered to the households over
conductors.
There are 10 households and each needs 1000 Watts
(for their toasters)
The electric company must therefore supply 10x1000 =
10,000 Watts.
Power = I x V I = P/V I = 10000/120 = 83 amps
But, electrical power is dissipated as heat according to P
= I2
R (subsitute V=RI from ohms law in above)
Lets assume R= 1: We now have heat dissipation =
(83.3)*(83.3)(1) = 6944 watts. Heat dissipation is
energy lost by the system. This loss is unavoidable!
7. To deliver the 10,000 watts that the consumer needs
requires that we generate 16,944 watts and hence have
an overall efficiency of 10,000/16,944 = 59% which
the consumer would pay for
How to solve the loss problem:
Current = Power/Voltage; If we increase V by a factor of 10,
then I lowers by a factor of 10 (at constant power) and the
power dissipated as heat lowers by a factor of 102
.
Hence if we increase 120 Volts to 1200 Volts we have only
69.4 watts of energy loss and a 99% energy efficient delivery
system This is why high voltage (typically 760 thousand
Volts or 760 kiloVolts) transmission lines are required to
delivery electricity from central generating sources (e.g. a
hydroelectric dam) to consumers/grids hundreds of miles
away.
How to change the voltage: Use a Transformer
A transformer uses alternating current in one coil to induce alternating
current in another. The induced voltage is given by: Vout = Vin x N2/N1
where N1 = Number of coils in the Primary and N2= Number of coils in the
secondary. When N2 is less than N1, we reduce Vout. This is why there are
transformers on power lines to step the voltage down to 120 Volts by the
time it reaches your house.
Energy conservation tells us that Power In = Power Out
so
8. Vout x Iout = Vin x Iin
Since Vin is very high, Iin is low and (to prevent transmission
loss); when Vin is stepped down to produce Vout (what you
get at your house), Iout increases so you can run your stuff.
And that's the way the world works.