Science's Not Boring

What is energy?

SCL Season 1 Episode 26

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0:00 | 12:42
Have you ever wondered what happens when you flip a light switch or charge your tablet? What is energy, and how does it power our entire world?! Join Mira and Finn on an electrifying adventure as they uncover the amazing secrets of where our power comes from! Did you know the sun blasts Earth with 173,000 terawatts of energy right now? If we catch just a tiny fraction of it with shiny solar panels, we could power everything on the planet! Discover how humans used to get all their electricity by burning messy fossil fuels, starting with inventor Thomas Edison's very first power plant. Then, explore the incredible new ways scientists are keeping the lights on without warming the planet! You'll be amazed by gigantic wind turbines standing 85 stories tall with blades longer than a football field, and massive concrete dams holding back rushing rivers. Best of all, find out how a tiny piece of invisible matter called an atom can be split to make huge amounts of nuclear power. Believe it or not, a piece of uranium the exact size of a gummy bear holds as much energy as a whole gigantic truckload of coal! Power up and join the fun!
SPEAKER_00

Welcome to Science Is Not Boring by Kidopoly.com. I'm Mira. And I'm Finn. Hey Finn, did you know that right at this very moment, the sun is blasting the earth with 173,000 terawatts of solar energy?

SPEAKER_01

Wait, 173,000 terawatts? That sounds like a made-up number.

SPEAKER_00

How much is that? It is 10,000 times more power than the entire world uses. If we could catch just a tiny fraction of it, we could power everything on Earth.

SPEAKER_01

No way! Everything? Like every TV, every refrigerator, and every single video game console.

SPEAKER_00

Exactly. Every school, hospital, and factory too. Today, we are exploring exactly where energy comes from and the amazing ways we power our whole world.

SPEAKER_01

I can't wait! From the sun in the sky to whatever powers my tablet, let's power up.

SPEAKER_00

Let's start with the basics. Everything that moves, lights up, or warms us needs energy. The whole human world runs on electricity, using about 25,000 terawatt hours every single year.

SPEAKER_01

That's a lot of power. But how did people get energy before we had all these fancy plugs and wires?

SPEAKER_00

For most of history, humans got energy mostly by burning things dug from the ground, like coal, oil, and natural gas. These are called fossil fuels. Because they come from old dinosaur fossils? Sort of. They actually formed from ancient plants and microscopic ocean organisms over hundreds of millions of years. Then, in 1882, a famous inventor named Thomas Edison opened the Pearl Street station in New York City. Was that the very first power plant? It was the first commercial one. He burned coal to boil water and make steam. The steam spun six giant machines called dynamos. Each one weighed 27 tonnes.

SPEAKER_01

27 tonnes? That's like five massive elephants stacked up. Yes.

SPEAKER_00

It provided enough electricity to light up 400 lamps in the neighbourhood. It changed the world forever. The engineers working in the station got so hot from the steam engines they had to take their coats off just to do their jobs. That's awesome. But wait, do we still burn coal today? We do still use a lot of fossil fuels. But here is the tricky part. Burning them makes smoke and invisible greenhouse gases that act like a giant blanket wrapped around the Earth. A blanket around the earth? Won't we get too hot? Yes, that blanket traps the sun's heat, which slowly warms the planet. So today, scientists are working incredibly hard to find clever, clean ways to keep the lights on without making that smoke. Exactly! Remember those 173,000 terawatts from the sun? We catch them using shiny solar panels. Sunlight travels 93 million miles through space in just eight minutes, smashes into the panel, and knocks tiny particles around to make an electric current.

SPEAKER_01

Whoa! It takes eight minutes for the light to get here, and then it instantly becomes electricity.

SPEAKER_00

Yep. There's a giant solar farm in India called the Bardla Solar Park that covers over 14,000 acres in the desert, soaking up all that power. But what happens when the sun goes down? Or if it's super windy instead? We use the wind, like those big white windmills I see on road trips. You got it, but they are getting way bigger. There is a new wind turbine called the Halliade X. Finn, it is 260 metres tall. That is exactly as tall as an 85-story skyscraper.

SPEAKER_01

85 stories? You could see that from miles away. How big are the spinning blades?

SPEAKER_00

Each blade is 107 metres long. That is longer than a whole football field. Just one single slow spin of those giant blades makes enough energy to power a house for two whole days.

SPEAKER_01

One spin? Whoosh! That's two days of TV and lights. Do they put them in the ocean?

SPEAKER_00

Yes, out in the ocean where the wind blows the hardest. And we don't just use wind, we also use rushing water. We build huge concrete walls called dams across rivers. Like a giant man-made waterfall. Exactly. The Hoover Dam in the United States is 726 feet tall and weighs 6.6 million tonnes. The water rushes through deep dark tunnels inside the dam and spins giant metal wheels called turbines. It's totally clean, just using the immense power of gravity and water. But Finn, what if I told you we have another incredible trick? Instead of looking at huge things like six million tonne dams and 85-story turbines, scientists looked at the tiniest things in the universe. You mean like a grain of sand? Or bacteria? Even smaller! Atoms! The tiny invisible building blocks that make up absolutely everything, including you and me.

SPEAKER_01

How do you get power from something you can't even see under a normal microscope?

SPEAKER_00

Scientists discovered a mind-blowing trick. If you take a specific kind of heavy atom called uranium and carefully split it in half inside a machine called a reactor, it releases a massive burst of heat. Wait, just from breaking it in half? That makes heat. A colossal amount of heat. We use that heat to boil water, which makes high-pressure steam, which spins a turbine to make electricity. It's called nuclear energy, and underwater the reactor core glows a beautiful bright blue. Does it make a bunch of smoke like the coal plants? Nope, zero smoke into the air. And here is the craziest part. Because splitting atoms is so incredibly powerful, you only need a tiny, tiny amount of fuel. How tiny? Like a baseball? Smaller! Imagine a single little cylindrical pellet of uranium. It's about half an inch tall. Basically the exact size of a gummy bear. A gummy bear?

SPEAKER_01

You can run a power plant on gummy bears!

SPEAKER_00

Well, uranium pellets. That one tiny gummy bear-sized pellet holds as much energy as one whole ton of coal, or 149 gallons of oil.

SPEAKER_01

Wait, wait, wait. You're telling me a gummy bear of uranium equals a whole giant truckload of coal?

SPEAKER_00

Yes, a single tiny pellet has enough energy to power your house for months. Isn't human ingenuity wild? That's why scientists are so hopeful about our future. We have millions of shiny solar panels catching sunlight, wind turbines taller than city buildings, and nuclear power plants getting massive energy from tiny little pellets.

SPEAKER_01

It means we don't have to rely on burning stuff forever. And we can stop wrapping that hot blanket around the Earth. Exactly!

SPEAKER_00

We are learning how to be super smart with the resources around us. We are solving the problem. Speaking of smart, time for some fun facts! Did you know the first ever working silicon solar cell was built way back in 1954? 1954? That's over 70 years ago. Who built it? A group of genius scientists at Bell Laboratories. Back then, they used it to power tiny electronics, but it proved we could capture the sun's magic. Today there are billions of solar panels.

SPEAKER_01

Okay, I have a question about those giant wind turbines. If the blades are longer than a football field, how do they move them to build it? They can't just put them on a train.

SPEAKER_00

Great question! It is a massive logistical challenge. They have to put them on special giant trucks that are hundreds of feet long. Sometimes they even have to close down entire highways in the middle of the night just to carefully drive one single blade around a corner.

SPEAKER_01

Imagine waking up and seeing a 300-foot fan blade driving past your bedroom window.

SPEAKER_00

It takes a lot of incredible teamwork to power the world. From the scientists studying invisible atoms to the truck drivers moving giant blades. Humans are coming up with better ideas every single day. Alright Finn, it's time for the quiz. Let's see how much you remember about energy.

SPEAKER_01

Oh boy, okay, I'm ready. Bring on the questions.

SPEAKER_00

First question. How many terawatts of solar energy hit the Earth continuously? Next one. Who built the Pearl Street station in 1882? Question three. How tall is the giant Haliad X wind turbine? Here's number four. What tiny piece of matter do scientists split to make nuclear power? Last question. One tiny gummy bear-sized uranium pellet holds as much energy as how much coal. Great job, let's see how you did. The first answer is 173,000 terawatts. For question two, it was the famous inventor Thomas Edison. Number three, the answer is 260 meters, which is as tall as an 85-story building. Question 4. They split atoms, specifically uranium atoms. And the final answer is one whole ton of coal. Wow, we covered so much today. From the sun blasting us with power to splitting atoms the size of gummy bears.

SPEAKER_01

My favourite part was definitely the wind turbine blades being longer than a football field. Science is so wild.

SPEAKER_00

It really is. Hey listeners, if you loved learning about giant wind turbines and tiny atoms today, please leave us a five-star review. Just scroll down in your app and tap the stars.

SPEAKER_01

Yeah, it really helps out. Oh, and don't forget to check out our site kidopoly.com. We've got tons of fun learning games and activities there.

SPEAKER_00

And if you want to shout out on the show or just want to say hi, send us an email at hello at kidopoly.com. We'd love to hear from you. Keep wondering and keep exploring. See you next time on Science Is Not Boring. Bye, everyone!