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IH How Induction Cooktops Work

See how a changing magnetic field induces currents in a compatible pan and turns electrical energy into heat.

10
lessons
~10 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. The Big IdeaDescribe the basic energy transfer in induction cooking.A changing magnetic field induces currents in compatible cookware, where resistance produces heat.
  2. The CoilExplain the role of the coil and power electronics.A copper coil under the glass carries high-frequency alternating current and creates the changing field.
  3. Faraday's LawConnect electromagnetic induction to pan heating.Changing magnetic flux induces eddy currents in the pan, and electrical resistance turns them into heat.
  4. The PanExplain why cookware is part of the heating system.The pan receives induced energy, so its material, flatness, thickness, and magnetic base affect performance.
  5. Magnetic CompatibilityIdentify cookware that can work on induction.A magnet test and induction markings help identify pans with ferromagnetic bases.
  6. Power ControlExplain how an induction cooktop varies heat output.Electronics meter high-frequency power while monitoring the coil, pan, and temperatures.
  7. Pan DetectionExplain why a zone may refuse to heat.The cooktop senses whether a suitably sized and positioned pan is responding to the coil.
  8. The Glass SurfaceDistinguish primary and residual heating of the glass.The field passes through the glass, but the hot pan can warm the surface after cooking.
  9. EfficiencyCompare induction's transfer path with other cooktops.Direct energy transfer to the pan can reduce losses through a flame, burner, and surrounding surface.
  10. Safe UseApply the mechanism to practical induction safety.Compatible cookware, residual heat awareness, careful metal use, and device guidance support safe operation.

Questions this course answers

What creates the changing magnetic field under an induction cooktop?

Power electronics send alternating current through the coil, creating the changing magnetic field that couples to the pan.

Put the main energy path in order.

The cooktop powers the coil, the coil creates the field, the field induces currents in the pan, and resistance turns those currents into heat.

Why does a magnet test help identify induction cookware?

Induction needs cookware with ferromagnetic material so the pan can respond effectively to the alternating magnetic field.

Grounded in trusted sources

  • U.S. Department of Energy, Making the Switch to Induction Stoves or Cooktops: https://www.energy.gov/articles/making-switch-induction-stoves-or-cooktops
  • U.S. Department of Energy, Induction Cooktop Analysis: https://bbi.energy.gov/sites/default/files/attachments/Induction_Cooktop_Analysis_Report.pdf
  • GE Appliances, Induction Cooking: https://www.geappliances.com/ge/cooking/induction.htm
  • Whirlpool, What Cookware Works With Induction Cooktops?: https://www.whirlpool.com/blog/kitchen/induction-cookware-guide.html
  • University Physics Volume 2, Faraday's Law: https://pressbooks.online.ucf.edu/osuniversityphysics2/chapter/faradays-law/
  • Wikimedia Commons, Category:Induction cookers: https://commons.wikimedia.org/wiki/Category:Induction_cookers

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