Shadowing-Übung: What is Voltage? - Englisch Sprechen Lernen mit Video
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To understand how electricity works, we need to zoom in on atoms, the things that make up all matter.
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Atoms are made up of three basic particles.
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That is, protons, which have a positive electric charge, neutrons, which have no electric charge, and electrons, which have a negative electric charge.
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The protons and neutrons are tightly packed in the core or nucleus of an atom,
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while electrons move about this nucleus in regions known as shells or orbitals.
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Right now, this atom is electrically neutral, as it has the same number of protons and electrons.
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With enough energy, an electron may be stripped away, leaving the atom with a net positive charge.
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Likewise, another atom may receive a freed electron, which then makes the atom electrically negative.
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When we have two objects with different electric charges due to the absence or presence of excess electrons, we say that we have static electricity.
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We can demonstrate this using a balloon and a soda can.
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When I rub a piece of cloth against the balloon, I strip away electrons from the piece of cloth and add them to the balloon.
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As a result, this balloon now has a net negative charge.
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When we bring it close to the can, the can chases the balloon.
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Let's look at why that's happening.
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The aluminum in the can is a conductor, which means that the electrons can freely move about the material.
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As we bring the negatively charged balloon near the metal, the electrons are pushed away to the far side of the can since like charges repel.
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That leaves an excess of positive charge on the side of the can nearest the balloon, which is pulled toward the balloon as opposite charges attract.
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Since the positive charges are closer to the balloon than the negative charges, the attractive force is greater than the repulsive force.
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This results in a net force that pulls the can toward the balloon.
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Let's see that again in instant replay.
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Before we go any further, let's talk about units.
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The SI unit for electric charge is the coulomb, generally abbreviated with an uppercase C.
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An electron has a charge of about negative 1 .602 times 10 to the negative 19th coulombs,
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and a proton has a charge of about positive 1 .602 times 10 to the negative 19th coulombs.
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Energy is usually given in joules, which is abbreviated with the symbol uppercase J.
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1 joule is equal to the amount of energy transferred to an object
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when a force of 1 newton is applied to that object over a distance of 1 meter.
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Energy can either be potential, which results from an object's position or arrangement, or kinetic, resulting from the object's motion.
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Both kinetic and potential energy are given in joules.
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Now we can define voltage.
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Voltage is a measure of electric potential between two points.
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The unit, volt, is defined as one joule of potential energy per unit charge given in coulombs.
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Let's explain this with an example.
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Let's say that I've got a particle with a negative one coulomb of charge.
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Then, let's say there is a particle with positive one coulomb of charge next to it.
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Since opposites attract and the positive particle is as close as it can get to the negative particle, everything is at rest.
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There is no kinetic or potential energy.
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Now, let's say
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that I need to use 10 joules of energy to move the positive particle from its resting position to this point.
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If I were to release it, it would move back to the negative particle.
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As a result, we can say that it has 10 joules of electric potential energy so long as I hold it here.
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Now, if I repeated this demo with three positively charged particles,
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it would take 30 joules of energy to move them the same distance away from the negative particle.
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So they have 30 joules of potential energy as long as I'm holding them here.
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As we defined earlier, voltage is the electric potential between two points.
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To calculate the voltage between their starting and ending points, we know that I did 30 joules of work to move the particles,
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and the total charge is 3 coulombs.
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So the voltage is 30 joules divided by 3 coulombs, which is 10 volts.
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We would say that the electric potential between these two points is 10 volts.
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If I released one of the particles, it would move back to the negatively charged particle.
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That would leave me with 20 joules of potential energy and 2 coulombs of charge, so the potential is still 10 volts.
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Even if I had no positive particles, the potential between the two points is still 10 volts.
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As you can see, electric potential energy is not the same as electric potential.
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When we start talking about moving electrons through conductors and electronic components, we are talking about current electricity, which is slightly different than static electricity.
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Let's take a look at a battery.
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It doesn't really matter how far apart the terminals of a battery are.
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The chemicals inside a battery determine the electrical potential between the terminals.
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A fully charged AA alkaline battery is listed as having 1 .5 volts.
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That means each coulomb of charge moving from one end of the battery will do 1 .5 joules of work.
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Now, compare that to a much larger D -cell battery.
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Each coulomb of charge will still only do 1 .5 joules of work, but a D -cell has far more coulombs of charge than a AA.
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As a result, D -cells will last a lot longer than AA batteries, doing the same amount of work.
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Static electricity can be a lot of fun, but more often than not, it's considered dangerous or a nuisance.
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One of the most dramatic displays of static electricity happens in nature.
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Storm clouds can build up a potential difference of millions of volts when compared to the Earth.
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And at some point, the electrons actually force their way through the air, creating lightning in order to balance out that charge difference.
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This sudden flow of electricity in an attempt to neutralize two statically charged objects is known as electrostatic discharge, or ESD.
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While lightning is a rather extreme display of electrostatic buildup and discharge, static electricity can still be quite useful.
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For example, many factory and power plant smokestacks employ a technology
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that uses static electricity to pull soot and ash out of the air as it flows up through the pipe, resulting in less pollution.
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Also, most cars are painted using a process called powder coating.
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In this, paint leaving the spray nozzle is given an electric charge, and the car body is given a different electric charge,
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which creates a stronger bond between the paint and the car body.
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This allows for a more uniform paint coverage
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and reduces paint waste since less of it's likely to stick around in the air or drip off the car body.
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Next time we'll dive into current electricity and talk about making it do work for us.
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Thank you.
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Wortschatz und Sprechhinweise zu dieser Lektion
Diese Sprechübung basiert auf dem Video „What is Voltage?“. Diese Wörter kommen am häufigsten vor: charge, electron, energy, joule, balloon. Dieses Video enthält 48 Sätze und 889 Wörter zum Nachsprechen. Der gesprochene Teil dauert 6:30. Der Sprecher spricht gleichmäßig mit etwa 137 Wörtern pro Minute – ein angenehmes Tempo fürs Shadowing. Nur 74 % der Wörter gehören zu den 3.000 häufigsten im Englischen, der Wortschatz ist also anspruchsvoll.
Wichtiger Wortschatz in diesem Video
15 lernenswerte Wörter aus dem Video, mit Aussprache und Bedeutung:
| Wort | Aussprache | Bedeutung |
|---|---|---|
| balloon Substantiv | /bəˈlun/ | Ballon, Luftballon |
| voltage Substantiv | /ˈvəʊltɪd͡ʒ/ | Spannung |
| particle Substantiv | /ˈpɑɹtək(ə)l/ | Teilchen, Partikel |
| atom Substantiv | /ˈætəm/ | Atom |
| electron Substantiv | /ɪˈlɛk.tɹɑn/ | Elektron |
| coat Substantiv | /ˈkoʊ̯t/ | Mantel |
| strip Verb | /ˈstɹɪp/ | wegnehmen |
| define Verb | /dɪˈfaɪn/ | bestimmen |
| lightning Substantiv | /ˈlaɪt.nɪŋ/ | Blitz |
| excess Substantiv | /ˈɛksɛs/ | Überfluss, Völlerei |
| attract Verb | /əˈtɹækt/ | anziehen |
| depend Verb | /dɪˈpɛnd/ | abhängen, ankommen |
| cloth Substantiv | /klɒθ/ | Stoff, Tuch |
| minus | /ˈmaɪ.nəs/ | weniger, minus |
| conductor Substantiv | /kənˈdʌktɚ/ | Dirigent, Dirigentin |
Phrasal Verbs, die du hören wirst
| Wort | Bedeutung |
|---|---|
| build up Verb | sich ansammeln, sich türmen |
Grammatik in diesem Video
Die Strukturen, die der Sprecher am häufigsten verwendet, mit den genauen Worten aus dem Video:
| Struktur | Im Video |
|---|---|
| Passiv be + Partizip Perfekt – wichtig ist, was geschieht, nicht wer es tut | are made · may be stripped · are pushed |
| Relativsätze who / which + Satz – eine Zusatzinformation über eine Person oder Sache | protons, which have · conductor, which means · balloon, which is |
Aussprache, auf die du achten solltest
- Die „th“-Laute: thirty /ˈθɝti/, cloth /klɒθ/
- Die Laute „sh“ und „zh“: shell /ʃɛl/, ratio /ˈɹeɪ.ʃoʊ/, pollution /pəˈluʃən/, adhesion /ˌædˈhiː.ʒən/
- Lange Wörter – auf die Betonung achten: electricity /ɪˌlɛkˈtɹɪsɪti/, aluminum /əˈlu.mɪ.nəm/, positively /ˈpɑ.zɪ.tɪv.li/, abbreviate /əˈbɹi.vi.eɪt/, electrically /ɪˈlɛk.tɹɪk.li/
Laute, die Deutschsprachigen schwerfallen:
- Stimmhafter Auslaut — /b/, /d/, /g/, /z/, /v/ am Wortende nicht verhärten: voltage /ˈvəʊltɪd͡ʒ/, depend /dɪˈpɛnd/, relative /ˈɹɛl.ə.tɪv/, cloud /ˈklaʊ̯d/, divide /dɪˈvaɪd/
- /æ/ — offener als „ä“: static /ˈstæt.ɪk/, atom /ˈætəm/, attract /əˈtɹækt/, dramatic /dɹəˈmætɪk/, absence /ˈæb.s(ə)n̩s/
- /dʒ/ — stimmhaft, nicht „tsch“: voltage /ˈvəʊltɪd͡ʒ/, arrangement /əˈɹeɪnd͡ʒmənt/, discharge /dɪsˈtʃɑɹdʒ/, joule /d͡ʒuːl/
So übst du mit diesem Video
- Höre dir das ganze Video einmal an, ohne zu sprechen, und notiere die Wörter, die du nicht kennst.
- Sprich Satz für Satz in normaler Geschwindigkeit nach und wiederhole jeden, bis dein Rhythmus zum Sprecher passt.
- Nimm dich auf und vergleiche mit dem Original; achte dabei auf Wörter wie balloon, voltage, particle.
Was ist die Shadowing-Technik?
Shadowing ist eine wissenschaftlich fundierte Sprachlerntechnik, die ursprünglich für die professionelle Dolmetscherausbildung entwickelt und durch den Polyglotten Dr. Alexander Arguelles populär gemacht wurde. Die Methode ist einfach aber wirkungsvoll: Du hörst englisches Audio von Muttersprachlern und wiederholst es sofort laut — wie ein Schatten, der dem Sprecher mit nur 1–2 Sekunden Verzögerung folgt. Anders als passives Hören oder Grammatikübungen zwingt Shadowing dein Gehirn und deine Mundmuskulatur, gleichzeitig echte Sprachmuster zu verarbeiten und zu reproduzieren. Studien zeigen, dass es Aussprachegenauigkeit, Intonation, Rhythmus, verbundene Sprache, Hörverständnis und Sprechflüssigkeit signifikant verbessert — was es zu einer der effektivsten Methoden für die IELTS Speaking-Vorbereitung und reale englische Kommunikation macht.