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Most ovens do involve electromagnetic energy. Microwave ovens are the best example because they work by deliberate creation of radio-type

radiation similar to the radiation from a radar antenna or dish. It is in the VHF (very high frequency) wavelength ( about 50cm). Microwave radiation excites the water molecules in the food in the oven. Ony food which contains water will be heated.

An electric oven has red-hot

elements which heat things in two ways. The air near the hot elements is heated by conduction and the the hot air then moves to the items to be cooked and passes the heat on to them also by conduction. The other way is by electromagnetic radiation, but not by VHF radio-like

waves. The heat radiation from hot elements is electromagnetic, but the wavelength is much shorter. It is just a little longer than visible red light's wavelength which less than one millionth of a millimetre. It is called infra-red

radiation. This heat heats the food in the oven in just the same way as the sun warms your skin when you stand in direct sunlight.

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