How does a Dam create electricity?

Summary

Who Smarted? - Educational Podcast for Kids Episode: How Does a Dam Create Electricity? Release Date: March 28, 2025

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Introduction: A Canoeing Encounter

The episode kicks off with the Narrator enjoying a peaceful canoe ride down a favorite stream, setting a serene and engaging tone for the listeners. At [00:04], the Narrator invites young listeners to imagine the experience, saying, "Psst. Hey, smarty pants. Trusty narrator here enjoying some nature as I paddle a canoe down one of my favorite streams."

Meeting the Beaver

At [00:20], the Narrator encounters a talking beaver blocking the stream, introducing an anthropomorphic character that captivates the young audience:

Beaver: "Hey, who goes there?"

Narrator: "Actually, I don't want anything from you. It's just you seem to be blocking traffic here." ([00:36])

The Beaver explains the purpose of his dam, highlighting the natural instinct of beavers to create ponds for protection:

Beaver: "Beavers build dams to create private ponds for ourselves. See, my beaver home, called a lodge, sits right smack in the middle of it." ([00:43])

Beaver Dams vs. Human Dams

The conversation shifts to a comparison between beaver-built dams and human-engineered dams. The Narrator introduces the concept of human dams with a teleportation app to showcase the Jinping One Dam in Sichuan, China, the tallest man-made dam in the world at 1001 feet:

Narrator: "This, my bucktooth friend, is the tallest man-made dam in the world. The Jinping One Dam in Sichuan, China. It is exactly 1001ft tall." ([01:42])

The Beaver humorously remarks on the differences, unable to chew through concrete:

Beaver: "Concrete sounds hard to chew through." ([02:05])

Purpose of Dams

At [04:54], the Narrator explains why humans build dams, differentiating the term "reservoir" from "pond" and outlining the various uses of water stored in reservoirs:

Narrator: "People use reservoirs for all kinds of things. Smarty pants. Which of these do you think we use the water in a reservoir for? Is it A, to water farmland, B, provide drinking water, or C, water skiing? The answer is all three." ([04:54])

Historical Overview of Dams

The episode provides a historical perspective, beginning with the Jawa Dam in ancient Mesopotamia (~3000 BC) and moving to the Cornaldo Dam built by the Romans in Spain in 100 CE:

Narrator: "The Cornaldo Dam. It was built by the ancient Romans back when Spain was one of their provinces, and it is the oldest dam in the world still in use." ([06:04])

Modern Uses: Recreation and Energy

The discussion transitions to modern dam uses, emphasizing recreation and energy generation:

Narrator: "One side benefit of dams' giant reservoirs is that they make great recreational areas where people can water ski, jet ski, sail, fish, swim, you name it." ([06:32])

However, the primary focus is on hydroelectric power:

Narrator: "We can use dams to generate power from water. Any idea what we call that kind of power, smartypants? Is it solar power, geothermal power, or hydroelectric power? The answer is hydroelectric." ([07:05])

How Hydroelectric Power Works

The Narrator breaks down the science behind hydroelectric power, explaining potential energy and the role of turbines and generators:

Narrator: "All of the water being held back by a dam has what's called potential energy because the force of gravity is pulling it to go somewhere other than where it is right now. If we release some of that water through a huge pipe into the dam's powerhouse, it will turn the blades of a machine called a turbine, which looks kind of like a giant pinwheel, and that spins a generator that makes electricity." ([08:15])

Types of Dams

At [09:03], the episode delves into the various types of dams, distinguishing between gravity dams, arch dams, buttress dams, and embankment dams:

Narrator: "Actually, not at all. There's all kinds of different dams, but a few main types. The biggest, heaviest ones are called gravity dams..." ([09:03])

The Beaver learns that the Jinping One Dam is an arch dam:

Narrator: "No, actually, the Jinping One is an arch dam." ([09:30])

Beaver: "So an arch gravity dam." ([10:48])

Spotlight on Hoover Dam

The episode spotlights the Hoover Dam, detailing its construction, purpose, and significance:

Narrator: "Behold, the Hoover Dam. Not far from Las Vegas on the border of Nevada and Arizona." ([15:02])

Key points about Hoover Dam include:

• Height: 726 feet above the Colorado River ([15:13])
• Construction Era: Built in the 1930s ([15:15])
• Purpose: Solving flooding issues and providing water and power to the American Southwest ([15:28])
• Power Generation: Supplies power to over 1 million homes via 17 generators ([15:31])

Narrator: "The Hoover Dam was built for two main reasons. Number one, to help solve the Colorado River's flooding problem. And number two, to provide water and power to the millions of people pouring into the American Southwest." ([15:31])

Construction Challenges

The Narrator describes the immense workforce and engineering challenges faced during the construction of Hoover Dam:

Narrator: "Only about 21,000, with 4,000 working at a time. Some had to scale these high walls on ropes to cut the notches for the dam. Others poured concrete, while others dug diversion tunnels." ([16:17])

Environmental Impact

Addressing environmental concerns, the Narrator explains how dams affect wildlife and ecosystems:

Narrator: "Beaver dams can harm fish and other wildlife by disrupting their ecosystem. Also, when a river first backs up and forms the reservoir, it can cause flooding, forcing animals to abandon their homes." ([17:02])

Conclusion: Reflecting on Dams

The episode wraps up with the Beaver contemplating the complexities and impacts of dams, reinforcing the educational aspects covered throughout the discussion.

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Key Takeaways:

• Function of Dams: Dams serve multiple purposes, including water storage for irrigation, drinking water, recreation, and most importantly, hydroelectric power generation.
• Types of Dams: Understanding different dam types—gravity, arch, buttress, and embankment—highlights the diversity in engineering approaches based on geographical and functional requirements.
• Historical Significance: From ancient Mesopotamia's Jawa Dam to the Roman Cornaldo Dam and modern marvels like the Hoover Dam, dams have been pivotal in human development.
• Environmental Considerations: While dams provide significant benefits, they also pose environmental challenges that require ongoing management and regulation.

Notable Quotes:

• Narrator at [08:15]: "If we release some of that water through a huge pipe into the dam's powerhouse, it will turn the blades of a machine called a turbine... and that spins a generator that makes electricity."
• Beaver at [07:59]: "Hold on. You're telling me humans can use simple everyday water to turn on lights, cook food, and run washing machines? That sounds like magic."
• Narrator at [17:02]: "Environmentalists are constantly working to pass laws to protect wildlife."

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Who Smarted? masterfully blends humor with educational content, making complex topics like dam engineering accessible and entertaining for young minds. Through engaging dialogues and informative segments, listeners gain a comprehensive understanding of how dams function, their history, and their impact on both society and the environment.

Transcript

[Narrator]

Psst. Hey, smarty pants. Trusty narrator here enjoying some nature as I paddle a canoe down one of my favorite streams. Have you ever been canoeing, smarty pants? If not, I highly recomm. There seems to be something blocking the stream.

[Beaver]

Hey, who goes there?

[Narrator]

Is that beaver talking to me?

[Beaver]

Yeah, that's right. What do you want, pal? I got no time for chit chat. I'm busy as a beaver.

[Narrator]

Right. Actually, I don't want anything from you. It's just you seem to be blocking traffic here.

[Beaver]

No kidding. That's kind of the point. This is my dam.

[Narrator]

Ah, leave it to the beaver to build a dam.

[Beaver]

What can I say? Beavers build dams to create private ponds for ourselves. See, my beaver home, called a lodge, sits right smack in the middle of it. This way no hungry beaver eating land animals can get to me.

[Narrator]

Pretty smart beaver. How'd you build your dam?

[Beaver]

Easy. I gnaw on a few small trees with my massive teeth until they fall. Then I drag them into place and fill any holes with branches, sticks and mud. You can watch my how to video on YouTube.

[Narrator]

Nice. Um, not sure if you're aware, but humans build dams too.

[Beaver]

Oh yeah? Ever built one as big as this beauty?

[Narrator]

Actually, yes. Here, I'll use my teleportation app to show you. Hang on, Beev.

[Beaver]

Whoa. What is this thing?

[Narrator]

This, my bucktooth friend, is the tallest man made dam in the world. The Jinping One Dam in Sichuan, China. It is exactly 1001ft tall.

[Beaver]

I gotta say, that don't look like any dam I've ever seen. What kind of weird looking trees did they use to build it?

[Narrator]

Oh, they didn't use trees. Human dams are made out of something called concrete.

[Beaver]

Concrete sounds hard to chew through.

[Narrator]

Yeah, not a good idea.

[Beaver]

Gee, I thought I was an expert at building dams, but clearly I got a lot to learn.

[Narrator]

Well, today's your lucky day. We're going to learn all kinds of cool things about dams. Like why do people build dams? What different kinds of dams are there? And what makes the world's most famous dam one of the greatest engineering feats in history.

[Beaver]

Sounds like this will be the best dam episode ever. D A M. Of course.

[Narrator]

Absolutely. Get ready for another whiff of history and science on how smarted.

[Beaver]

Who's smarted?

[Narrator]

Who's smart? Is it you? Is it me? Is it science? Or history? Listen up everyone. We make smarting lots of fun on who's Smart. And this episode is brought to you by Squarespace. Smartypants, it's quiz time. If you wanted to Start a business, share your ideas with the world, or finally, launch your site about history's weirdest inventions. What is the smartest way to do it? Is it A, shouting your message from the top of a volcano? B, training an army of synchronized skywriting parrots? Or C, building a sleek professional website with Squarespace. If you said C, congratulations, you win the Internet. With Squarespace's design intelligence, you can build a beautiful website in minutes. No coding, wizardry or secret handshake required. Want to sell stuff? Squarespace payments lets you accept Apple Pay, Klarna, and even credit cards. And because social media runs the universe, Squarespace seamlessly connects your site to Instagram, YouTube, and more, so your fans or future customers can easily find you. Start your free trial [e-mail] smartid and when you're ready to launch, use code smarted to save 10% on your first website, website, or domain. Now who's ready to make history? Believe it or not, Mr. Beaver, this enormous Jinping One Dam is just one of many dams, smartypants. See if you can guess how many dams there are in the world. Is it around A, 8,000, B, 80,000, C, 800,000, or D, 8 million? If you said there are around 800,000 dams in the world, you got it. Whoa.

[Beaver]

Wow, that's a lot of dams. But I'm confused. The pond created behind this dam is huge. But humans don't have hungry predators you need to protect yourself from. So why do you gotta build all those dams?

[Narrator]

Well, first of all, we don't call the water held back by a dam a pond. We call it a reservoir. People use reservoirs for all kinds of things. Smarty pants. Which of these do you think we use the water in a reservoir for? Is it A, to water farmland, B, provide drinking water, or C, water skiing? The answer is all three. The oldest known dam is the Jawa Dam, which was built way back around 3000 BC in ancient Mesopotamia. By the way, even though it was called the Jawa Dam, it was not built by the Jawas. From Star Wars. Mesopotamian farmers were able to reroute the water from the dam's reservoir into their fields to provide irrigation, which is a fancy word for watering plants.

[Beaver]

Pretty smart human. I'd love to see some more dams.

[Narrator]

You got it, beaver. Let's travel back in time. Welcome to Spain in the year 100 ACE.

[Beaver]

Ah, bueno.

[Narrator]

This is the Cornaldo Dam. It was built by the ancient Romans back when Spain was one of their provinces, and it is the oldest dam in the world still in use.

[Beaver]

Today, talk about a well built dam.

[Narrator]

The Romans used its water for irrigation, just like the Mesopotamians. But they also used some for drinking water and to fill their baths.

[Beaver]

Okay, but what about this water skiing you mentioned?

[Narrator]

Yeah, the Mesopotamians and ancient Romans didn't have motorboats, so no water skiing for them.

[Beaver]

Hey, look at me, I'm water skiing.

[Narrator]

Lift your tail. Lift your tail.

[Beaver]

Good idea.

[Narrator]

One side benefit of dam's giant reservoirs is, is that they make great recreational areas where people can water ski, jet ski, sail, fish, swim, you name it. In fact, America's largest reservoir, Lake Mead, which was created by the Hoover Dam, is super popular for all of that kind of stuff.

[Beaver]

Hey, look at me, I'm water skiing again.

[Narrator]

But as fun as all that is, it isn't the main reason that we build dams these days. It's for energy. That's right. We can use dams to generate power from water. Any idea what we call that kind of power, smartypants? Is it solar power, geothermal power, or hydroelectric power? The answer is hydroelectric. Good job. If you got that, smarty pants. The prefix hydro means water. Dams currently generate about 15% of of the world's electricity. That's more than the amount produced by nuclear and solar power combined. And many countries, including big ones like Canada and Brazil, get most of their electrical power from dams. So, yeah, dams are a big deal.

[Beaver]

Hold on. You're telling me humans can use simple everyday water to turn on lights, cook food, and run washing machines? That sounds like magic. How do you do it?

[Narrator]

Well, all of the water being held back by a dam has what's called potential energy because the force of gravity is pulling it to go somewhere other than where it is right now. If we release some of that water through a huge pipe into the dam's powerhouse, it will turn the blades of a machine called a turbine, which looks kind of like a giant pinwheel, and that spins a generator that makes electricity.

[Beaver]

Cool. Hmm, Maybe I could build a generator and make electricity to watch TV in my lodge.

[Narrator]

Eh, you better off listening to podcasts too, smart Ed. Anyway, eager beaver, that basically covers what our human dams do.

[Beaver]

I'm assuming each dam looks pretty much the same. Once you've seen one dam, you've seen them all.

[Narrator]

Actually, not at all. There's all kinds of different dams, but a few main types. The biggest, heaviest ones are called gravity dams, and they're just what they sound like. A huge concrete wall that uses its weight to resist the force of all that water pushing on it. You need to build a gravity dam on Some seriously solid rock or you're going to have a problem.

[Beaver]

Is the tallest dam in the world a gravity damn?

[Narrator]

No, Actually, the jinping one is an arch dam. What do you think an arch dam looks like, smarty pants? Is it A, curved like an arch and built into A canyon's walls? B, so tall that you have to arch your back to see the top of it? Or C, only built near a McDonald's? Okay, that was a gimme. It's a. They actually cut notches into the canyon walls for the archdam to fit into. With that kind of dam, the pressure of the water, ironically makes it stronger because it pushes it further into place against the walls.

[Beaver]

That's too bad. I could go for some Mickey D's anyway. What other kind of dams you got?

[Narrator]

Well, there's your Buttress dam, which is a concrete slab reinforced by supports. And your embankment dam, which is made out of earth or rock. Because earth isn't as strong as concrete, those dams have to be super thick.

[Beaver]

Hey, that's kind of like my dam.

[Narrator]

Exactly. And some dams are a combination of types, including the most famous dam of.

[Beaver]

All, my cousin Bucky's dam up the river.

[Narrator]

No, smarty pants. Are there any dams you can think of by name? Call them out. Yep, I didn't hear too many, but I did hear a bunch of you say the Hoover Dam.

[Beaver]

Oh, yeah, I've heard of that.

[Narrator]

The Hoover Dam is part arch, part gravity dam.

[Beaver]

So an arch gravity dam.

[Narrator]

Exactly. And it's also one of the greatest engineering feats of all time.

[Beaver]

Oh, yeah? How so?

[Narrator]

I'll show and tell you right after this quick break. This episode is brought to you by ixl. As someone who's constantly balancing work and life, I know how tough it can be to make sure kids get the academic support they need, whether they're homeschooled or in a traditional classroom. That's why IXL has been a lifesaver. It's an online learning program that covers math, language arts, science and social studies with interactive practice problems, games, and video tutorials. Plus, it makes learning fun, just like whosmarted. For homeschool parents, iexcel is the perfect supplement to your curriculum, giving kids personalized learning at their own pace. And for parents of traditional school kids, it is a great way to reinforce what they're learning in class. Whether they need extra help or are just looking for a challenge. Make an impact on your child's learning. Get IXL today. Podcast listeners get an exclusive 20% off when you sign up at ixl.com smarted Visit ixl.com smarted now to give your child the best learning support available. IXL where learning Clicks this episode is brought to you by Squarespace. Smarty Pants, it's quiz time. If you wanted to start a business, share your ideas with the world, or finally launch your site about history's weirdest inventions, what is the smartest way to do it? Is it A. Shouting your message from the top of a volcano? B. Training an army of synchronized skywriting parrots or circumstances? Building a sleek professional website with Squarespace if you said C Congratulations, you win the Internet. With Squarespace's design intelligence, you can build a beautiful website in minutes. No coding, wizardry or secret handshake required. Want to sell stuff? Squarespace Payments lets you accept Apple Pay, Klarna and even credit cards. And because social media runs the universe, Squarespace seamlessly connects your site to Instagram, YouTube and more, so your fans or future customers can easily find you. Start your free trial [e-mail] smarted and when you are ready to launch, use code smarted to save 10% on your first website or domain. Now who's ready to make history? Hey smarty parents. I love Green Chef because of how absolutely easy the meals are to make and how every night it feels like we're eating at a restaurant right at home. The variety is excellent and includes meals for special diets like keto, gluten free and calorie smart. With pre portioned ingredients, there's less prep, less mess and more time to enjoy delicious meals. Green Chef's easy to follow directions means my kitchen phobic family members actually cook when we get our Green Chef kit. And it's a great way to get your kids involved in the kitchen too. Plus, Green Chef is owned by HelloFresh, which lets me switch between the brands for even more variety. And now my listeners can enjoy both and at a discount with me. Thrive all year with clean easy meals from Green chef. Go to greenchef.com smartedfree and use code Smarted free to get free salads for two months plus 50% off your first box. That's greenchef.com smarted free and use code Smarted free to get free salads for two months plus 50% off your first box. Green Chef the number one meal kit for eating well. Now back to who Smarted. Okay Beev, you ready to visit the most famous dam on the planet? Yeah, the one where they used as much concrete as it would take to build a sidewalk completely around the earth?

[Beaver]

Yeah.

[Narrator]

The one where they had to excavate more rock than it took to build the Great Wall of China.

[Beaver]

How many times do I gotta say, yeah.

[Narrator]

Gotcha. We're going. Behold, the Hoover Dam. Not far from Las Vegas on the border of Nevada and Arizona.

[Beaver]

Yikes. How high up are we?

[Narrator]

726Ft above the Colorado River. When it was built back in the 1930s, it was the world's tallest dam, and it was designed to last for 2000 years.

[Beaver]

I like things that are built to last.

[Narrator]

The Hoover Dam was built for two main reasons. Number one, to help solve the Colorado River's flooding problem. And number two, to provide water and power to the millions of people pouring into the American Southwest. Today, it provides power to over 1 million homes, thanks to 17 generators that each weigh as much as. What, smarty pants? A whale? A fully loaded 747 airplane, or the Empire State Building? The answer is B, a fully loaded 747 airplane. That's about a million pounds, by the way, if you're keeping track.

[Beaver]

Wow. Must have taken a lot of people to build this thing.

[Narrator]

Only about 21,000, with 4,000 working at a time. Some had to scale these high walls on ropes to cut the notches for the dam. Others poured concrete, while others dug diversion tunnels.

[Beaver]

Diversion tunnels?

[Narrator]

Oh, tunnels to redirect the river so they could have a dry place to build the dam. It got as hot as 140 degrees inside those tunnels.

[Beaver]

Hey, try wearing a fur coat the middle of August.

[Narrator]

Get this. They had so many people working on the Hoover Dam, they had to build a new city nearby just for them to live in.

[Beaver]

Wow. Pretty cool. But I've got a question.

[Narrator]

Great. I love answering questions.

[Beaver]

Doesn't stopping up a whole river like that confuse the animals that live there? One day a salmon is swimming upstream, the next day, there's a giant wall in their way.

[Narrator]

You're right. Beaver dams can harm fish and other wildlife by disrupting their ecosystem. Also, when a river first backs up and forms the reservoir, it can cause flooding, forcing animals to abandon their homes. So environmentalists are constantly working to pass laws to protect wildlife.

[Beaver]

Good. I'm glad somebody gives it beaver. Darn. I was gonna say darn.

[Narrator]

Come on, let's go water skiing. A super shout out to superfan Vera Lynn in Vandalia, Missouri. We hear you think who's smartith is awesome. Well, we think you're pretty awesome too, Smartypants. This episode Dams was written by Steve Melcher and voiced by Taya, the bee of garlic and Jerry Colber. Technical direction and sound design by Josh Hoover Hahn, who Smarted is recorded and mixed at the Relic Room Studios. Our associate producer is Max Kamasky. The theme song is by Brian Suarez with lyrics written and performed by Adam Tex Davis. Who Smarted was created and produced by Adam Tex Davis and Jerry Colbert. This has been an Atomic Entertainment production. Who's Smart Ed?