How does an induction cooktop heat the pan but not the air?. Visually show the coil creating a changing magnetic field, inducing currents in compatible cookware, and converting that energy into heat inside the metal. Include quick demos like paper near the surface staying cool while the pan heats, plus a clear note on why some pans do not work.

Transcript

Imagine an induction cooktop with a hidden copper coil that rapidly cycles electrical current beneath a smooth glass surface. This rapid current creates a dynamic, changing magnetic field that rises from the coil. When a ferromagnetic pan is placed on the cooktop, the magnetic field induces swirling eddy currents that transform electrical energy into heat within the pan. For example, a piece of paper placed near the cooktop remains cool while the pan heats up instantly. Pans made from non-magnetic materials like copper or aluminum fail this test since a magnet won't stick to them, preventing induction heating. Thus, induction cooking efficiently heats the pan and its contents directly, leaving the ambient air cool and safe.