不思議な金属パイプ／Mysterious Metal Pipes
97.9 هزار بار بازدید -
4 سال پیش
-
DENJIRO: Today, I’ll show you
DENJIRO: Today, I’ll show you a mysterious science magic trick using this metal pipe.
I’m going to drop a metal ball into this pipe.
Of course, the ball goes through the pipe and falls down. But this is where the magic starts.
Let’s try that again.
BOY: Huh? The ball isn’t falling down!
DENJIRO: It took quite some time for the ball to come out.
Here’s the trick. The first ball was a metal ball. As you can see, the second ball was a magnet.
NARRATOR: Magnets don’t stick to aluminum. However...
When a magnet goes through a metal pipe, an electric current runs through the pipe, and a magnetic force is created in the pipe.
This magnetic force slows down the magnet falling through the pipe. That’s why it took time for the magnet to fall.
DENJIRO: Now, let’s try that with three kinds of metal. Copper, aluminum, and brass.
Let’s try dropping the magnets at the same time.
ONSCREEN TEXT: Brass, aluminum, copper
BOY: It took the longest with the copper pipe!
DENJIRO: The magnet fell the quickest in the brass pipe, and fell the slowest in the copper pipe. The speed at which the magnet falls differs because electricity runs differently in different metals.
NARRATOR: With copper, which easily conducts electricity, the resulting magnetic force is stronger. Therefore, the magnet is slowed down the most.
Aluminum conducts less electricity. As for brass, where the magnet fell the quickest, it doesn’t conduct electricity easily.
DENJIRO: That means you can use a magnet to figure out which metals conduct electricity more.
NARRATOR: Copper and aluminum, which easily conduct electricity, are used for electrical wires. Electric power transmission lines not only need to conduct electricity, but have to be light and durable, so they are made by combining aluminum with steel.
DENJIRO: I hope energy will bring you all happiness. Our magic word is "Happy Energy!”
I’m going to drop a metal ball into this pipe.
Of course, the ball goes through the pipe and falls down. But this is where the magic starts.
Let’s try that again.
BOY: Huh? The ball isn’t falling down!
DENJIRO: It took quite some time for the ball to come out.
Here’s the trick. The first ball was a metal ball. As you can see, the second ball was a magnet.
NARRATOR: Magnets don’t stick to aluminum. However...
When a magnet goes through a metal pipe, an electric current runs through the pipe, and a magnetic force is created in the pipe.
This magnetic force slows down the magnet falling through the pipe. That’s why it took time for the magnet to fall.
DENJIRO: Now, let’s try that with three kinds of metal. Copper, aluminum, and brass.
Let’s try dropping the magnets at the same time.
ONSCREEN TEXT: Brass, aluminum, copper
BOY: It took the longest with the copper pipe!
DENJIRO: The magnet fell the quickest in the brass pipe, and fell the slowest in the copper pipe. The speed at which the magnet falls differs because electricity runs differently in different metals.
NARRATOR: With copper, which easily conducts electricity, the resulting magnetic force is stronger. Therefore, the magnet is slowed down the most.
Aluminum conducts less electricity. As for brass, where the magnet fell the quickest, it doesn’t conduct electricity easily.
DENJIRO: That means you can use a magnet to figure out which metals conduct electricity more.
NARRATOR: Copper and aluminum, which easily conduct electricity, are used for electrical wires. Electric power transmission lines not only need to conduct electricity, but have to be light and durable, so they are made by combining aluminum with steel.
DENJIRO: I hope energy will bring you all happiness. Our magic word is "Happy Energy!”
4 سال پیش
در تاریخ 1399/04/27 منتشر شده
است.
97,949
بـار بازدید شده