Microwave Oven


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MICROWAVE OVEN a presentation by: Ajay Kulkarni 2bv09is004 BVBCET:

MICROWAVE OVEN a presentation by: Ajay Kulkarni 2bv09is004 BVBCET

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Microwave oven is one of the most widely used household appliances. Most of homes and most of conveniences store and restaurants have microwave oven. The reason for its popularity is that it cooks food in an amazingly short amount of time. They are also extremely efficient in their use of electricity because a microwave oven heats only the food – nothing else. We’ll discuss the mystery behind the magic of “meals in a minute” with microwave cooking.


OPERATING PRINCIPLE OF MICROWAVE OVEN A microwave oven uses microwaves to heat food. Microwaves are radio waves. In the case of microwave ovens, the commonly used radio wave frequency is roughly 2,500 megahertz (2.5 gigahertz). Radio waves in this frequency range have an interesting property….

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they are absorbed by water, fats and sugars. When they are absorbed they are converted directly into atomic motion and motion is converted into heat. Microwaves in this frequency range have another interesting property: they are not absorbed by most plastics, glass or ceramics.

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And metal reflects microwaves, which is why metals cause spark in a microwave oven. The reason that metal reflects microwaves is that no electronic waves resident in inside of conductor because conductor’s conductivity is infinity as we studied in our course.

Block Diagram :

Block Diagram


ADVANTAGES Cooking time is short - Destruction of nutrients is less - No physical change of foods - Melting process is easy - Sterilization effect exists - There is no flame, then treatment is easy - Constraint with metal container

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- Heat force control is difficult - Water evaporation - Closed container is dangerous because it could be burst - Surface toasting is imp

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