他では絶対見られない！　超伝導 本当のスゴさ（後編

Summary

This video demonstrates the fascinating concept of superconductivity, where electrical current flows without resistance when cooled to extremely low temperatures. The narrator explains how, by using a special current meter with a magnet, viewers can observe this continuous electrical flow. The process involves cooling a superconductive material with liquid nitrogen, allowing electricity to flow indefinitely through a wire loop. The video highlights how this phenomenon only occurs when the material is cold, and once it warms up, the current ceases. The concept of superconductivity is presented as an incredible and seemingly magical event where electricity never stops flowing as long as it remains cold.

Takeaways

• 😀 Superconductivity occurs when materials become very conductive after cooling down.
• 😀 In superconductivity, once electricity flows through, it keeps flowing indefinitely.
• 😀 Since electricity is invisible, a special ammeter with a magnetic needle is used to measure current flow.
• 😀 The setup involves creating a thin loop of superconducting wire to demonstrate perpetual electricity flow.
• 😀 The principle used to flow electricity in the loop is similar to a generator, where moving a magnet inside a coiled wire generates electricity.
• 😀 When electricity is passed through a normal conductor, the flow stops after a short period.
• 😀 Superconductivity doesn't work at room temperature, so cooling is required to achieve it.
• 😀 Liquid nitrogen is used to cool the superconducting material to demonstrate its properties.
• 😀 Once cooled, the electricity keeps flowing indefinitely in the superconducting loop without any energy loss.
• 😀 The flow of electricity in a superconductor only stops when the temperature rises and the material warms up.
• 😀 Superconductivity is a fascinating phenomenon where electricity can flow forever as long as the material remains cold.

Q & A

What is superconductivity?

Superconductivity is a phenomenon where a material, when cooled to a certain temperature, allows electricity to flow through it with zero resistance, meaning the electric current can flow indefinitely.

How is superconductivity demonstrated in the script?

Superconductivity is demonstrated by cooling a superconducting material with liquid nitrogen, forming a loop of wire, and then passing electricity through it. The current continues to flow without stopping as long as the material remains cold.

Why does electricity flow forever in superconductivity?

Once a superconducting material is cooled below its critical temperature, the resistance disappears, allowing the electric current to flow endlessly without any energy loss.

What tool is used to measure the electric current in the experiment?

A special current meter made with a magnet is used to measure the electric current. When electricity flows nearby, the needle of the meter moves.

What principle is used to generate the electricity in the experiment?

The principle of electromagnetic induction is used. By moving a magnet inside a coil of wire, electricity is generated.

What happens to the electric current when the temperature increases?

When the temperature rises, the superconducting material loses its superconductivity, and the electric current stops flowing.

Why is liquid nitrogen used in the experiment?

Liquid nitrogen is used to cool the superconducting material to the necessary low temperature for it to exhibit superconductivity.

How does the electric current behave in a superconducting loop when cooled with liquid nitrogen?

When the superconducting loop is cooled with liquid nitrogen, the electric current flows continuously without any resistance, as long as the material stays cold.

What happens when the superconducting material warms up?

When the superconducting material warms up, it loses its ability to carry current without resistance, and the flow of electricity stops.

Why is superconductivity important?

Superconductivity is important because it allows for the lossless flow of electricity, which has potential applications in energy transmission, magnetic levitation, and more, revolutionizing various technologies.