Science of induction cooktop, in demand amid LPG pinch, Pg4

Key Highlights:

• Disruption of cooking gas supply due to the West Asia conflict has increased demand for induction cooktops.
• Induction cooktops use electromagnetic heating to directly heat cookware, unlike traditional gas stoves that rely on combustion.
• These cooktops utilize alternating current (AC) to generate a fluctuating magnetic field, which induces eddy currents in ferromagnetic cookware.
• Induction cooktops are more energy-efficient, converting 85% to 90% of electrical energy into cooking heat, compared to 40% to 50% for LPG stoves.

Detailed Insights:

• Induction cooktops feature a coil of copper wire beneath a ceramic or glass surface, generating a fluctuating magnetic field when AC flows through it.
• The fluctuating magnetic field passes through the glass surface and induces eddy currents in the ferromagnetic cookware due to Faraday's Law of Induction.
• Eddy currents encounter electrical resistance in the cookware, converting kinetic energy into thermal energy (heat) according to Joule's Law of Heating.
• The heat generated is proportional to the square of the current, meaning small increases in current lead to larger increases in heat, making the process efficient.
• While energy-efficient and safer, induction cooktops have limitations, including lower durability, dependence on electricity, and incompatibility with all cooking styles.

Scientific/Technical Concepts Involved:

• Alternating Current (AC): Electric current in which the flow of electrons reverses direction at regular intervals.
• Faraday's Law of Induction: A changing magnetic field induces a voltage and electric current in nearby electrical conductors.
• Eddy Currents: Localized, swirling electrical currents generated in a conductor by a changing magnetic field.
• Joule's Law of Heating: The heat generated when current flows through a material is proportional to the current squared, resistance, and time.

Induction Cooking