Induction cooktops heat iron pots by inducing eddy currents in the pot's bottom, using intense, high-frequency currents in a magnetic work coil. A (simplified) equivalent circuit model for a small induction rice cooker is shown below.
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Step 1: The equivalent circuit model for a small induction rice cooker typically consists of a power source, a work coil, a pot with its resistance and inductance, and a load resistor representing the rice cooker itself. Show more…
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Induction Cooker: How does an induction cooker work? Clues: 1) The pot is hot but the stove is not hot. 2) The cooker works well with iron and steel pots and works poorly with copper or aluminium pots. A. There is a heater coil in the cooker and heat is produced following P = I²R. Iron and steel has a lower heat capacity and heats up more easily and so works better. B. There is a magnetic coil in the cooker and a changing magnetic field is produced. This creates eddy currents in the pot and the pot produces heat following P = I²R. Iron and steel have a larger resistance and hence produce more heat than copper or aluminium. C. There is a small gap between the cooker and the pot which make them work like a capacitor. As iron and steel have a higher capacitance than copper or aluminium, more electrical energy is stored which creates more heat for cooking.
Gregory D.
An induction furnace uses electromagnetic induction to produce eddy currents in a conductor, thereby raising the conductor's temperature. Commercial units operate at frequencies ranging from $60 \mathrm{~Hz}$ to about $1 \mathrm{MHz}$ and deliver powers from a few watts to several megawatts. Induction heating can be used for warming a metal pan on a kitchen stove. It can be used to avoid oxidation and contamination of the metal when welding in a vacuum enclosure. To explore induction heating, consider a flat conducting disk of radius $R,$ thickness $b,$ and resistivity $\rho .$ A sinusoidal magnetic field $B_{\max } \cos \omega t$ is applied perpendicular to the disk. Assume the eddy currents occur in circles concentric with the disk. (a) Calculate the average power delivered to the disk. (b) What If? By what factor does the power change when the amplitude of the field doubles? (c) When the frequency doubles? (d) When the radius of the disk doubles?
An induction furnace uses electromagnetic induction to produce eddy currents in a conductor, thereby raising the conductor’s temperature. Commercial units operate at frequencies ranging from 60 Hz to about 1 MHz and deliver powers from a few watts to several megawatts. Induction heating can be used for warming a metal pan on a kitchen stove. It can be used to avoid oxidation and contamination of the metal when welding in a vacuum enclosure. At high frequencies, induced currents occur only near the surface of the conductor, in a phenomenon called the “skin effect.” By creating an induced current for a short time interval at an appropriately high frequency, one can heat a sample down to a controlle depth. For example, the surface of a farm tiller can be tempered to make it hard and brittle for effective cutting while keeping the interior metal soft and ductile to resist breakage.
Manish J.
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