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CDA Buying Advice – Hobs

How does induction cooking work?

Induction cooking heats a cooking vessel by electrical induction, instead of by thermal conduction from a flame, or an electrical heating element. The cooking vessel must be made of or contain a ferromagnetic metal such as cast iron or stainless steel. In an induction hob, a coil of copper wire is placed under the cooking pot and an alternating electric current is passed through it. The resulting oscillating magnetic field induces a magnetic flux, producing an eddy current in the ferrous pot, which acts like the secondary winding of a transformer. The eddy current flowing through the resistance of the pot heats it. Energy transfer with induction hobs is around 84 percent compared to around 74 percent for gas or ceramic electric so there are good energy savings. Safety is an important aspect too – there is no naked flame so fire is extremely unlikely.

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What is eddy current?

Eddy current is a localized current that has been induced in a conductor by a varying magnetic field. In layman’s terms, Eddy currents are loops of electrical current that are created in the conducting material by a magnetic field that changes from positive to negative. The current is created by changing the magnetic field.


What is electrical induction?

Electrical induction is also called magnetic induction. It is the ‘voltage’ produced in a conductor due to its reaction with a magnetic field.

Health and safety: Pacemakers

It’s true. Due to the electromagnetic field created by an induction hob, pacemaker wearers should keep a distance of at least 60cm or 2ft from the appliance as it may interfere with your settings.


More on Hobs in the buying guide