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B2 Upper Intermediate English 4:26 655 words Educational

The solution to our energy problems is … a toaster - Rachel Yang

TED-Ed · 262,532 views · Added 2 months ago

AI Summary

This TED-Ed video uses the humble toaster as an analogy to explain heat batteries — a promising clean energy technology that stores thermal energy in bricks, rocks, and molten salt. B2 learners will gain vocabulary in energy and sustainability, including 'fossil fuel combustion,' 'megawatts,' 'thermal energy,' 'industrial heat,' and 'carbon pollution.' Excellent for understanding how scientific analogies work in English.

Learning Stats

B2

CEFR Level

655

Total Words

330

Unique Words

6/10

Difficulty

Vocabulary Diversity 50%

Subtitles (32 segments)

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00:07

In 1919, American mechanic Charles Strite invented something humanity had desired for millennia: the automatic toaster.

00:15

Various cultures had long toasted their bread over fire in a process that required constant attention and produced uneven results.

00:22

But in 1905, toast technology evolved with the invention of a new nickel and chromium composite.

00:28

When an electric current ran through these filaments, they would overflow with energy and radiate heat.

00:34

And since the flexible metal could be coiled to match the dimensions of a standard slice of bread, this heat could be dispersed evenly— perfectly toasting an entire slice all at once.

00:44

The only problem left was overcooking, which Strite’s model addressed with an automatic timer that simultaneously shut off the heating element and launched finished toast skyward.

00:54

Strite’s appliance would’ve been the best invention since sliced bread, except that sliced bread was actually invented later to accommodate toasters.

Full subtitles available in the video player

Key Vocabulary (21)

air A1 noun

The invisible mixture of gases that surrounds the Earth and which humans and animals breathe. It also refers to the open space above the ground or the general atmosphere of a place.

industrial A2 noun

An industrial is a company involved in the manufacturing of goods, such as machinery, equipment, or supplies. In finance, it specifically refers to a share or stock in such a manufacturing company.

high A1 adjective

tall

Grammar in This Video

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