Can Induction Cooktops Produce Enough Heat to Cook Food Efficiently?

AI Thread Summary
Induction cooktops utilize electromagnetic induction to heat cookware, primarily through the induction of eddy currents in conductive materials rather than directly altering atomic orientation. The efficiency of induction heating can reach around 80%, with standard units operating at over 2000W. While magnetizing and demagnetizing magnetic materials can produce some heat, it is not an efficient heating method compared to induction. The effectiveness of heating depends on various factors, including the material's properties and dimensions. Understanding the principles of induction is essential for grasping how these cooktops function.
fysik
Messages
73
Reaction score
0
hello!

can continuously changing magnetic field increase the temperature of a magnetic material?

my hypothesis is that the continuously change of magnetic field will cause a continuous change in orientation of the atoms of the magnetic material and thus it will increase the thermal energy of the material and thus its temperature

is this something real?

thanks!
 
Physics news on Phys.org
fysik said:
can continuously changing magnetic field increase the temperature of a magnetic material?
Yes - this is the principle of induction heating, but it is mainly by the induction of small eddy currents in a conducting metal rather than flipping atoms or their nuclei.
 
can you give me an example? how much can I heat up a magnetic material with a 120V operated magnet?
 
For inductive heating you don't need magnetic material.
But magnetizing and demagnetizing a magnetic material repeatedly may result in some heating too. I believe it is not very efficient for heating something.
Look up "magnetostriction heating".

How much you can heat something, by any method, will depend so much on the specific material, size, shape, many other conditions, that such a question cannot be answered meaningfully.
 
  • Like
Likes rumborak
A standard 220v induction heater can produce in excess of 2000W. It feeds a copper coil a very high cycle AC wave which causes huge magnetic flux. This in turn will heat the metal utensil.
Efficiency is around 80% i think.
 
I thought induction heater works with infrared, not with electromagnetic
 
fysik said:
I thought induction heater works with infrared, not with electromagnetic

maybe you should check out the meaning of the word induction and how it applies in physics :smile:

http://www.thefreedictionary.com/induction

and scroll down a little

Dave
 
Back
Top