電気をつくる電磁誘導／Creating Electricity with Electromagnetic Induction

DENJIRO: We use electricity on a daily basis. Something very important for this is electromagnetic induction, which is one of the basic principles of electricity generation. This is a hand-crank generator. The wire is connected to this toy here. Let me quickly crank the generator. You can see that the toy moves. If I vary the speed at which I crank the generator… you can see that the amount of electricity differs and affects the movement of the toy. There's a coil and magnet inside this generator, and electricity is being generated through electromagnetic induction. I have a coil here. There's an LED attached to it. Let me move a magnet right by the coil. GIRL: The LED turned on! DENJIRO: Electricity is being generated, and the LED is flashing. When the magnet is moving by the coil and creating a difference in magnetism, electricity runs through the coil. This is how electricity is generated through electromagnetic induction. Speaking of magnets, did you know that the Earth we're standing on is a magnet as well? This is a compass. It's a tool used for finding out directions. The needle is reacting to the magnetism of Earth. If Earth is a magnet, then let's see if we can generate electricity with its magnetism. I have a wire here. This is going to act as the coil that we saw in the previous experiment. It's connected to a detector that can detect even slight amounts of electricity. Now, let me swing the wire like a jump rope. The needle should move if I am successfully able to generate electricity. Let's give it a go. GIRL: The needle is moving! DENJIRO: The needle moving is proof that electricity is being generated. Since a coil is moving by Earth, which is a magnet, we are able to generate electricity. I hope energy will bring you all happiness. Our magic word is "Happy Energy!"