Levitating Barbecue! Electromagnetic Induction

TL;DR

Faraday's electromagnetic induction experiment demonstrates how a changing magnetic field can generate electric current, allowing objects to levitate and light up.

Transcript

Let's switch it on. Let's see what it does. Through this coil of thick wire, we're about to pass a huge alternating electric current. On top is a 1 kg aluminium plate. So we hear that noise. What's that noise? It's the vibration of the plate, because it's vibrating at two times the frequency of this one. Woah! Woooaaaahhhhhhh!! hahaha, how does it ... Read More

Key Insights

• 😋 Faraday's experiment with an iron ring and coils established the principle of electromagnetic induction.
• ⌛ Insulating wire during Faraday's time required a significant investment of time and effort.
• 🏑 The changing magnetic field created by an alternating electric current can induce currents in nearby objects, causing them to levitate.
• 🥵 The induced current can also generate heat, making objects hot.
• 🈸 Faraday's electromagnetic induction principles have practical applications in lighting and heating technology.
• 🏘️ The Royal Institution in London houses an intact representation of Faraday's magnetic lab.
• 🌉 Faraday's discovery bridged the gap between electricity and magnetism, revolutionizing scientific understanding.

Questions & Answers

Q: What did Faraday's experiment with the iron ring and coils demonstrate?

Faraday's experiment showed that a changing magnetic field can induce an electric current in a nearby coil, providing evidence for electromagnetic induction.

Q: How does passing an alternating electric current through a bottom coil levitate an aluminum plate?

The changing magnetic field created by the alternating current induces currents in the aluminum plate, which, in turn, generate an opposing magnetic field, causing the plate to levitate.

Q: Can the induced current in the aluminum plate also cause objects to heat up?

Yes, the induced current in the plate dissipates its energy as heat, similar to how a toaster element heats up when current passes through it.

Q: What other applications of Faraday's electromagnetic induction can be observed in the experiment?

The experiment demonstrates that the induced current can also make lightbulbs glow, showcasing the conversion of electrical energy into light.

Summary & Key Takeaways

• Faraday's experiment involved wrapping wires around an iron ring and creating a changing magnetic field by passing an electric current through it.

• When a battery was connected to one coil, a pulse of current was induced in the other coil, demonstrating electromagnetic induction.

• By passing a large alternating electric current through a bottom coil, an aluminum plate can be levitated and lightbulbs can be illuminated.