Microwaves are produced by electronic devices called magnetrons, which convert electrical energy into microwave radiation. This radiation heats and cooks food by exciting the water molecules within it.

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To warm-up foods !

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A klystron, magnetron or travelling-wave tube will generate microwaves. So will a vircator and an inductive output tube. These are just some of the vacuum tubes used to generate microwaves. In a microwave oven, the magnetron, which is a type of cavity resonator, is the device of choice.