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  • [♪ INTRO]

  • Hi, everyone! Squeaks and I have a problem.

  • We were about to start  cooking lunch, but then we saw

  • that it's the perfect day to be outdoors.

  • We're trying to figure out how we can cook

  • and play outside at the same time

  • I know! We can build a solar oven!

  • Solar ovens are a lot like kitchen ovens.

  • They're basically boxes that heat up inside,

  • and that are great at keeping the  heat trapped inside of the box.

  • If you put food inside of the  oven, the heat cooks the food.

  • [Squeaks squeaks]

  • What makes it a solar oven?

  • Well, kitchen ovens use electricity  or burn gas to make themselves hot.

  • A solar oven uses solar energy  — or energy from the Sun!

  • When light from the Sun shines into a solar oven,

  • it heats up the inside of the box.

  • This means they're perfect for cooking outside!

  • You can make a solar oven using  materials you might already have.

  • Hey, Squeakswill you help me design our oven?

  • [Squeaks squeaks]

  • Awesome!

  • I've brought some materials for us.

  • First, we have a pizza box to  use as the main box of the oven,

  • and I have some tin foil, too.

  • Tin foil is a great insulator, or  something that's great at trapping heat.

  • So, it can help us to keep  the heat inside the box.

  • I'll cover the inside of the box  with tin foil, and tape it down.

  • Hm, now, we have our first design challenge.

  • We need sunlight to get into  our box, but if we open the box,

  • all the heat will get out.

  • Is there something that we could  change about our box to get

  • sunlight in, while still keeping the box closed?

  • [Squeaks squeaks]

  • A windowthat could work!

  • It will be like how windows can  let sunlight into a building,

  • even if they're closed.

  • I'll make a flap, so we can  open and close ourwindow.”

  • And kids, make sure that  when you're cutting your flap

  • that an adult is around to help you.

  • Normally, windows use glass to  separate the inside and outside.

  • We want something clear like  glass, that will let sunlight in,

  • but that doesn't break as easilyWhat do you think we should use?

  • [Squeaks squeaks]

  • Plastic wrap is a great idea!

  • We can cover the window in plastic  wrap, and tape it around the edges

  • to keep the heat inside the oven.

  • Now sunlight can get into the  oven, and heat up our food!

  • Uh-oh… I think there's another  problem with our design.

  • The only sunlight that can  get into our box is the light

  • that shines straight into our window.

  • And that's not enough.

  • So, here's our second design challenge!

  • How can we get more light into our solar oven?

  • I've got an idea! Did you know light can bounce?

  • If you shine a flashlight inmirror, the light will bounce off it

  • and back at you.

  • And it does this on more than just mirrors!

  • Anything with a shiny surface can  make light bounce, or reflect.

  • So if we want to reflect some  sunlight into our solar oven,

  • we need something shiny!

  • [Squeaks squeaks]

  • The tin foil! The tin foil is very shiny!

  • We can try using that to reflect  the sunlight into the box.

  • Thanks Squeaks!

  • I'll tape some tin foil to the section  of lid we cut out to make our window.

  • If we angle this just right, the  sunlight aimed at the tin foil

  • should bounce off of it and  shoot straight into our oven!

  • We can use this pencil to hold  that lid at the right angle.

  • Next, we'll put the food  on a plate inside to cook.

  • That leaves us with our third  and final design challenge:

  • Which color plate should we use?

  • We have a bunch of paper plates  from Sam the Bat's birthday party.

  • We have a white plates and black plates.

  • [Squeaks squeaks]

  • I'm glad you asked.

  • The colors matter because dark  colors heat up in the sunlight

  • faster than lighter colors.

  • You might have noticed this if  you've ever worn a dark shirt outside

  • in the summer!

  • We probably want a dark-colored plate to help us

  • heat up our food then, don't we?

  • [Squeaks squeaks]

  • I agree, let's use the black  plate. That one is darkest.

  • It looks like we're ready  to test out our solar oven!

  • How about some pizza bagels?

  • [Squeaks squeaks]

  • We're going to head outside  to test our solar oven.

  • Depending on what happens, we  might make changes to our design.

  • Maybe we'll paint the entire  inside of the oven black,

  • or find a shiny mirror to help  reflect more sunlight into the window.

  • What ideas do you have to make our oven better?

  • Ask a grown-up to help you to build  your own design, and test it out!

  • Good luck with your cooking!

  • And if you'd like to keep  exploring with me, Squeaks, Jessi,

  • and the rest of our friendshit the subscribe button.

  • We'll see you next time here at The Fort.

  • [♪ OUTRO]

[♪ INTRO]

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B1 中級

Build the Best Solar Oven Ever! | Engineering Project

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    roseottos に公開 2021 年 02 月 23 日
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