Shadowing Practice: Power – Rate of Work - Learn English Speaking with Video

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Ever walked up a flight of stairs and wondered why running up feels so much harder?
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Think about what it takes to get up stairs.
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With every step, your muscles lift your body against gravity.
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If you ran up instead, you'd still have to lift your weight through the same height.
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That's where power comes in.
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Power tells us how quickly work is done.
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To find average power, divide the work by the time it takes.
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Work is measured in years, time in seconds, and power in watts.
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So, if you see a power rating of one watt, that means one gear of energy is transferred every second.
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Let's put some numbers to that.
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Imagine a climb that takes 1 ,200 years of work against gravity.
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If you take 12 seconds, your average power is 100 watts.
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What if you do that same climb in 6 seconds?
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Now you're doing 200 years of work each second.
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Half the time, twice the power.
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Imagine taking a ride in a sports car.
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The driver presses the accelerator and you feel yourself pressed back into the seat as the car picks up seats.
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The car is gaining kinetic energy.
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How quickly can its engine supply energy?
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Take a 400 kilowatt engine.
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At full power, it can deliver 400 ,000 joules of mechanical energy every second.
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Now picture a standard halfback on an everyday drive.
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It can reach motorway speed, too.
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Suppose this engine is rated at 60 kW.
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At full power, that's 60 ,000 wheels every second.
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If the two cars have similar mass, they need roughly the same gain in kinetic energy to go from rest to motorway speed.
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With similar grip and losses, the more powerful car can get there seen.
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Now let's look at the world's fastest landowner, the Cheetah.
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Imagine how quickly it has to gather speed when it chases its head.
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In just a quick drive, its muscles give its body a big increase in kinetic energy.
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That's a burst of high power.
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Compare that with a hard -working husky.
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Picture it pulling a light sled along a snowy trail.
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Once the sled is gliding at a steady speed, is the husky still doing work?
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It is.
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The snow resists the sled's motion, so the husky has to keep pulling.
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Its talent is disdaining that effort over a long distance.
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Next time you head upstairs, Think about two questions.
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How much work does it take to lift you to the top?
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And how quickly do you do it?
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The first tells you about the energy changes.
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Put that together with the time taken and you have your average path.
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Thank you.

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Vocabulario y notas de pronunciación para esta lección

Esta lección de conversación se basa en el vídeo “Power – Rate of Work”. Las palabras que más se repiten: energy, speed, quickly, husky, kinetic. Este vídeo tiene 43 frases y 431 palabras para practicar shadowing. La parte hablada dura 3:26. El hablante mantiene un ritmo constante de unas 126 palabras por minuto, cómodo para el shadowing. El 83 % de las palabras está entre las 3.000 más comunes del inglés; conviene repasar el resto antes de empezar.

Vocabulario clave de este vídeo

15 palabras del vídeo que vale la pena aprender, con su pronunciación y significado:

PalabraPronunciaciónSignificado
watt sustantivo/wɑt/vatio, watt
muscle sustantivo/ˈmʌs.əl/músculo
climb verbo/ˈklaɪ̯m/escalar, subir
gravity sustantivo/ˈɡɹævɪti/gravedad
rat sustantivo/ɹæt/rata
stairs sustantivo/ˈstɛɹz/escalera, gradas
everyday adjetivo/ˈɛvɹiˌdeɪ/de diario, cuotidiano
gear sustantivo/ɡɪɚ/pertrecho, pertrechos
compare verbo/kəmˈpɛɚ/comparar, parangonar
trail sustantivo/tɹeɪl/rastro, pista
chase verbo/t͡ʃeɪs/perseguir, asenderear
roughly adverbio/ˈɹʌf.li/toscamente
mechanical adjetivo/məˈkænəkəl/mecánico
resist verbo/ɹɪˈzɪst/resistir
burst verbo/bɜːst/reventar

Phrasal verbs que vas a escuchar

PalabraSignificado
get up verbolevantarse
pick up verbocoger, asir

Pronunciación a tener en cuenta

  • Palabras largas — cuida el acento: mechanical /məˈkænəkəl/, accelerator /əkˈsɛl.əˌɹeɪ.tɚ/

Sonidos difíciles para hispanohablantes:

  • s + consonante al inicio — sin añadir una “e” delante: stairs /ˈstɛɹz/, steady /ˈstɪdi/, sled /ˈslɛd/, snowy /ˈsnoʊi/
  • /v/ — no es /b/: los dientes tocan el labio inferior: gravity /ˈɡɹævɪti/, everyday /ˈɛvɹiˌdeɪ/, divide /dɪˈvaɪd/
  • /z/ — sonora, no /s/: stairs /ˈstɛɹz/, resist /ɹɪˈzɪst/, upstairs /ˌʌpˈstɛɹz/

Cómo practicar con este vídeo

  1. Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
  2. Haz shadowing frase por frase a velocidad normal, repitiendo cada una hasta que tu ritmo coincida con el del hablante.
  3. Grábate y compara con el original, prestando atención a palabras como watt, muscle, climb.

¿Qué es la Técnica de Shadowing?

Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.

Técnica de shadowing: lee la guía completa paso a paso →