Kuppersbusch EMWG6260, Руководство пользователя, Страница: 7 / 30

33
EN
The advantages of microwaves
In conventional ovens, heat radiated by electrical elements or
gas burners slowly penetrates the food from outside to
inside. On account of this there is a major amount of energy
is wasted heating the air, the oven components and the food
containers.
In a microwave oven, heat is generated by the food itself and
the heat travels from inside to outside. No heat is lost to the
air, the walls of the oven cavity or the dishes and containers
(if these are suitable for use in microwave oven), in other
words, only the food is heated.
Microwave ovens have the following advantages:
1. Shorter cooking times; in general these are up to 3/4
less than the time required for conventional cooking.
2. Ultra-fast food defrosting, thus reducing the danger of
bacterial development.
3. Energy savings.
4. Conservation of the nutritional value of foods due to
the shorter cooking times.
5. Easy to clean.
How a microwave oven works
In a microwave oven there is a high tension valve called a
magnetron which converts electrical energy into microwave
energy. These electromagnetic waves are channelled to the
interior of the oven through a wave guide and distributed by a
metallic spreader or through a turntable.
Inside the oven the microwaves propagate in all directions
and are reflected by the metal walls, uniformly penetrating
the food.
Why food heats up
Most foods contain water and water molecules vibrate when
subjected to microwaves.
The friction between molecules produces heat which raises
the temperature of the food, de-freezing it, cooking it or
keeping it hot.
Since the heat arises inside the food:

This can be cooked with little or no liquid or fats/oils;

De-freezing, heating or cooking in a microwave oven
is quicker than in a conventional oven;

The vitamins, minerals and nutritional substances in
the food are conserved;

The natural colour and aroma of the food are
unchanged.
Microwaves pass through china, glass, cardboard or plastic
but do not go through metal. For this reason, metal
containers or ones with metal parts must not be used in a
microwave oven.
Microwaves are reflected by metal...
... but go through glass and china...
and are absorbed by foods.