PROPONENTS OF ELECTROMAGNETIC THEORY TAGALOG | GRADE 10 SCIENCE QUARTER 2 MODULE 1 LESSON 2
Summary
TLDRThis lesson focuses on the development and principles of electromagnetic (EM) theory. The video begins with a pre-test, followed by a discussion of the major contributors to EM theory, including Oersted, Ampere, Faraday, Maxwell, and Hertz. Their discoveries linked electricity and magnetism, leading to the understanding of EM waves. The video highlights key principles of EM waves, such as their wave-like behavior, speed, and transverse nature. Applications of EM theory in daily life are also explored, with a reflection on its role in modern technology advancements.
Takeaways
- đ The lesson focuses on the development and principles of electromagnetic (EM) theory.
- đŹ The key scientists contributing to the theory are Ărsted, Ampere, Faraday, Maxwell, and Hertz.
- âĄď¸ Ărsted discovered that an electric current can create a magnetic field, a groundbreaking finding in electromagnetism.
- đĄ Ampere built upon Ărsted's work, showing that electricity can produce magnetism, coining the term 'electrodynamics.'
- 𧲠Faraday discovered that a changing magnetic field produces an electric current, introducing the concept of electromagnetic induction.
- đ Maxwell unified the findings of previous scientists, formulating the equations that describe how electric and magnetic fields interact.
- đĄ Hertz experimentally confirmed Maxwell's predictions by generating and detecting radio waves, proving the existence of electromagnetic waves.
- đ EM waves do not require a medium to propagate, unlike mechanical waves such as sound or water waves.
- âď¸ EM waves travel at the speed of light and are transverse waves, with electric and magnetic fields oscillating perpendicularly.
- đ Electromagnetic theory has vast applications in modern technology, from household appliances to space exploration.
Q & A
What is the main topic of the lesson discussed by Teacher Liz?
-The main topic is the development and principles of electromagnetic theory, including its key proponents and applications.
What are the objectives of the lesson?
-The objectives are to trace the development of electromagnetic theory, discuss its basic principles, and explain its applications.
What was Ărstedâs contribution to the electromagnetic theory?
-Hans Christian Ărsted discovered that a moving electric current can create a magnetic field, demonstrating the connection between electricity and magnetism.
How did Ampère contribute to electromagnetic theory?
-AndrÊ-Marie Ampère discovered that electricity can generate magnetism, which was demonstrated by producing magnetic attraction and repulsion without magnets. He coined the term 'electrodynamics,' which is now known as electromagnetism.
What was Faraday's key discovery?
-Michael Faraday discovered that a changing magnetic field can produce an electric current, a phenomenon known as electromagnetic induction.
How did Maxwell unify the discoveries of Ărsted, Ampère, and Faraday?
-James Clerk Maxwell formulated mathematical equations that unified the discoveries of Ărsted, Ampère, and Faraday. He showed that a changing electric field produces a magnetic field and predicted the existence of electromagnetic waves.
What was Heinrich Hertzâs role in electromagnetic theory?
-Heinrich Hertz experimentally verified the existence of electromagnetic waves in 1887 by generating radio waves, confirming Maxwellâs predictions about electromagnetic waves traveling at the speed of light.
What are some basic principles of electromagnetic theory?
-Some basic principles include: 1) Light behaves as a wave of changing electric and magnetic fields, 2) Electromagnetic waves travel at the speed of light, 3) They are transverse waves, and 4) They donât require a medium to propagate.
What are some applications of electromagnetic theory?
-Applications of electromagnetic theory include its use in domestic appliances, transportation, communication systems, medical devices, space technology, and various industries.
How did electromagnetic theory contribute to the advancement of modern technology?
-Electromagnetic theory has led to the development of technologies like wireless communication, electricity generation, medical imaging, and satellite systems, significantly impacting modern life.
Outlines
đ Introduction to Electromagnetic Theory and Lesson Objectives
In this section, Teacher Liz introduces the lesson on electromagnetic theory. The objectives are to trace the development of electromagnetic theory, discuss its basic principles, and explain some of its applications. The segment also includes a pre-test with agree or disagree questions on electricity and magnetism. Students are encouraged to engage by answering questions and reflecting on the relationship between electricity and magnetism.
⥠Hans Christian Ărsted's Discovery of Electromagnetism
This part focuses on Ărstedâs accidental discovery in 1820 that electric currents create magnetic fields, marking a breakthrough in the understanding of electromagnetism. His experiment showed that an electric current flowing through a wire could affect a nearby magnetic needle, linking electricity and magnetism. This discovery laid the foundation for further exploration in the field.
đ AndrĂŠ-Marie Ampèreâs Contribution to Electrodynamics
Here, the work of AndrĂŠ-Marie Ampère is highlighted, where he demonstrated that magnetic attraction and repulsion can be created by running electric currents through wires. He named this new field 'electrodynamics,' which today is part of electromagnetism. Ampèreâs findings supported Ărstedâs discovery and showed that electricity could generate magnetism without the use of traditional magnets.
𧲠Michael Faradayâs Electromagnetic Induction
Faraday's discovery in 1831 showed that a changing magnetic field could induce an electric current, reversing Ărsted and Ampère's findings. This concept, known as electromagnetic induction, became a crucial principle in electromagnetism. Faradayâs work was paralleled by Joseph Henryâs experiments in America, further advancing the understanding of electromagnetic phenomena.
đ James Clerk Maxwellâs Unified Electromagnetic Theory
Maxwell is credited with unifying the findings of Faraday and Ărsted into a single electromagnetic theory through mathematical equations. In 1864, he predicted the existence of electromagnetic waves and hypothesized that light itself is an electromagnetic wave. Maxwellâs equations laid the groundwork for the modern understanding of electromagnetism.
đť Heinrich Hertz's Verification of Electromagnetic Waves
Heinrich Hertz experimentally confirmed the existence of electromagnetic waves in 1887 using a spark generator and a metallic ring. His work provided concrete evidence supporting Maxwellâs theory. Hertzâs experiments demonstrated that electromagnetic waves, such as radio waves, travel at the speed of light, solidifying Maxwellâs predictions.
đ Basic Principles of Electromagnetic Theory
This section covers five basic principles of electromagnetic theory: (1) many natural phenomena exhibit wave-like behavior, (2) light is a wave of changing electric and magnetic fields, (3) electromagnetic waves travel at the speed of light, (4) electromagnetic waves are transverse waves, and (5) oscillating charges produce changing electric fields.
đ§ Applications of Electromagnetic Theory
The applications of electromagnetic theory are vast, covering fields such as household technology, industry, communication, medicine, and space exploration. These applications show the theory's relevance in everyday life and its importance in modern technology.
đĄ Reflection and Pre-Test Revisit
The lesson concludes with a reflection question on how electromagnetic theory has advanced modern technology. Students are asked to answer this in their notebooks. The video ends by revisiting the pre-test and introducing the next lesson, which will cover the wavelengths and frequencies of electromagnetic waves.
Mindmap
Keywords
đĄElectromagnetic Theory
đĄElectric Field
đĄMagnetic Field
đĄElectromagnetic Waves
đĄOersted's Discovery
đĄAmpere's Law
đĄFaraday's Law of Induction
đĄMaxwell's Equations
đĄHeinrich Hertz
đĄElectromagnetic Induction
Highlights
Introduction to electromagnetic theory and its significance in understanding the relationship between electricity and magnetism.
Lesson objectives: trace the development of electromagnetic theory, discuss its basic principles, and explore its applications.
Pre-test: statements include 'Electricity and magnetism are separate phenomena' and 'Light is composed of changing electric and magnetic fields.'
First scientist: Hans Christian Ărsted's 1820 discovery that a moving electric charge creates a magnetic field, laying the foundation for electromagnetic theory.
AndrĂŠ-Marie Ampèreâs contribution: magnetism can be produced by electricity, demonstrated through attraction and repulsion in current-carrying wires.
Michael Faraday's 1831 discovery of electromagnetic induction: a changing magnetic field produces an electric current.
Faraday's work inspired Joseph Henry, who independently experimented with electromagnetic induction using electromagnets in the U.S.
James Clerk Maxwell unified electricity and magnetism in 1864, predicting the existence of electromagnetic waves and proposing that light is an electromagnetic wave.
Maxwellâs equations: a changing electric field produces a magnetic field, even without an electric current.
Heinrich Hertz's 1887 experiment confirmed Maxwellâs theory by generating and detecting radio waves, proving the existence of electromagnetic waves.
Key principle: electromagnetic waves do not require a medium to propagate and travel at the speed of light.
Electromagnetic waves are transverse waves with electric and magnetic fields oscillating perpendicular to each other.
Applications of electromagnetic theory are vast, ranging from household appliances to communication, medicine, and space technology.
The lesson encourages reflection on how electromagnetic theory has advanced modern technology.
Students are asked to complete a graphic organizer detailing the contributions of key scientists to the development of electromagnetic theory.
Transcripts
hi this is teacher liz we shall continue
our discussion
about electromagnetic waves
electromagnetic theory scientist
involves a theory nato still under the
same
most essential learning competency our
lesson is about
the proponents of electromagnetic
theory
we have the following objectives first
is to trace the development of the
electromagnetic theory
second is to discuss the basic
principles of
electromagnetic theory and third is to
explain
some applications of electromagnetic
theory
we shall have our pre-test first
agree or disagree we have five items
with a 10 second pause in between let's
start
electricity and magnetism are separate
phenomena
10 second pause
a changing electric field produces a
magnetic field
pause
an electric field results from a static
magnetic field
pause
em waves are transverse waves
pause
finally light is composed of changing
electric and magnetic fields
pause
moving on let's consider the following
pictures
and magnetism
19th century touring
revolutionary period non-scientific
discoveries and inventions
and relationships electricity and
magnetism
can we combine them
questions
and you may write this down in your
notebooks
as you go along with this video
first question who were the scientists
that contributed
to the formulation of em theory
second what are the basic principles of
em
theory and third what are some
applications of em theory
okay for our first question
a scientist contribute to the
formulation
of em theory
actually a lot of scientists have
contributed
to this theory but we shall focus our
discussion with these
five people with very important
contributions
important we will find out
first is orsted
1820 sihans christian orsted
islam physicist molassa denmark
relationship electricity and magnetism
like the electrician at next set of
shannon wire
now my current to demonstrate the
heating effect of current
pero accidentally
when the wire is connected to the
battery
since gowasu magnet and needle non
magnetic effect an electric current
and he concluded that an electric
current can create
a magnetic field major
groundbreaking
[Music]
electricity and magnetism until his
discovery
experiment
[Music]
electricity and magnetism
so that's orsted and
he discovered that a moving charge
creates a magnetic field
let's go to ampere
mobilis french physicist
andrea marie ampere
wires
in repulsion of wires by
running current through the wires and
changing its direction
he had produced a magnetic attraction
and repulsion
without the use of any magnets
all of it was generated by electricity
he termed this new era of exploration
electrodynamics but nowadays
electrodynamics at electromagnetism are
treated as one and the same
so that's ampere who discovered
that magnetism can be produced by
electricity
in support of orsted's discovery
next we have faraday
if magnetism may be produced by
electricity
as what orsted and ampere find out
could the reverse be possible pusibique
[Music]
1831
[Music]
galvanometer
a magnet faraday observed
that current is detected only when the
magnet is moving
in and out of the coil
therefore he concluded that a
changing magnetic field produces
an electric current which is the reverse
of orsted in ampere's discovery
parade called it electromagnetic
induction
little did faraday know
america 1831.
it don't see joseph henry
is an american scientist
experiments about electromagnetic
induction
using electromagnets
[Music]
as the father of electromagnetic
induction
that was faraday who discovered
that a changing magnetic field produces
an electric current
now we go to maxwell
nina or steaded faraday sa relationship
non-electricity and magnetism
scottish physicist nasi james clerk
maxwell
parapagaralan confiding pakistan
into one unified theory nuong 1864
then translate nee maxwell and finding
sneparaday
into mathematical equations
electromagnetic theory
while faraday had discovered that a
changing magnetic field produces an
electric field maxwell added
the converse a changing electric field
produces a magnetic field even in the
absence of electric currents
electric charge or electric current
propagate an electromagnetic wave
basis fury near maxwell
with this maxwell predicted the
existence of electromagnetic waves
he also hypothesized that em waves
travel at the speed of light and that
light is a form
of electromagnetic wave
[Music]
yes he presented the mathematical
explanation about it
but detecting electromagnetic waves is
another story this is something that was
answered
by our next and final scientist featured
today
and that is hertz
thanks to heinrich hertz a german
physicist who verified the existence of
electromagnetic waves
traveling at the speed of light in 1887
heinrich equipment was a simple spark
generator
this is a very high voltage generator
coupled to an antenna
and a metallic ring at some distance
apart
contamasi maxwell
when the generator was turned on voila
a spark was seen in the metallic ring
gap
electromagnetic waves traveled from the
antenna
to the metallic ring gap causing a spark
maxwell was right
maxwell must have been celebrating in
his grave because
he died in 1879 eight years ago before
hertz experiment
what hurts generated in his apparatus
was
radio waves a form of electromagnetic
waves
providing evidence to maxwell's
electromagnetic theory
and now these are the scientists that
contributed
to the development of electromagnetic
theory
we now go to our next question
a basic principles in electromagnetic
theory
una many natural phenomena exhibit
wave-like behavior so we have water
waves
i like
una many natural phenomena exhibit
wave-like behavior we have waterways
earthquake waves and sound waves that
require a medium to propagate
these are examples of mechanical waves
second light can also be described as a
wave
a wave of changing electric and magnetic
fields
that propagate outward from their source
this waves do not require a medium to
propagate
the third one is that em waves travel
at three times ten raised to eight
meters per second
through a vacuum fourth principle
em waves are transverse waves
the changing electric field and magnetic
field
oscillate perpendicular to each other
into the direction of the propagating
waves
and fifth when an oscillating charge
accelerates
the b c b velocity
its electric field changes too
finally our question number three what
are some
applications of electromagnetic theory
we can find enormous practical
applications
of electromagnetism in everyday life
from domestic appliances to research
applications
in households industry transportation
communication medical field
even in space technology the
applications of
electromagnetism seem endless
we will get to know more about these in
module 2.
so here's the question for your
reflection log
how did electromagnetic theory result in
the advancement of modern technology
take a three-minute pause and answer
this question in your science notebook
and now we are down to our posters
fill in the following graphic organizer
include the
important discoveries and contributions
of these scientists to the development
of
electromagnetic theory write them down
in your science notebook
and finally let's revisit your pre-test
[Music]
and that ends our lesson too
up next lesson three wavelengths and
frequencies of electromagnetic waves
see you in our next video
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