Whirlpool MWA 121/HA Instruction for Use download pdf (Page 17)

Microwave oven function:

In a conventional oven the heat radiated by the

resistances or gas burners, slowly penetrates the food

from the outside to the inside. There is, therefore, a

great loss of energy in the heating of the air, oven

components and recipients.

On the other hand, in microwave ovens the heat is

generated in the interior of the food itself, heating it

from the inside outwards. There is therefore no loss of

energy as the air, interior walls of the oven and

recipients (when adequate) do not heat up with

microwaves.

Microwave ovens have the following advantages:

1. Save on cooking time: in general there is a 3/4

reduction of the cooking time than with conventional

methods.

2. Ultra-quick defrosting that prevents bacteria

development.

3. Electricity saving.

4. Maintaining the nutritive value of the food due to the

cooking time reduction.

5. Easy cleaning.

In the microwave oven there is a high voltage valve

called "Magnetron" that converts electric energy to

Microwave energy. These electromagnetic waves are

conducted to the inside of the oven cavity by means of

wave-guide and spread by a mode stirrer or by a

turntable.

Inside the oven, the Microwaves spread out in all

directions and are reflected by the metallic walls,

penetrating the food evenly.

Most food contains water, whose molecules vibrate

with Microwaves.

The friction between the molecules generates heat,

which causes a temperature rise in the food, defrosting

it, cooking it or keeping it warm.

As the heat is formed inside the food:

- It may be cooked with little or no liquid or fat;

- Defrosting, heating or cooking in the microwave oven

is quicker than in a conventional oven;

- Vitamins, minerals and nutritive substances are

preserved;

The Microwaves pass through porcelain, glass,

cardboard and plastic but not through metal.

Therefore, recipients made of or containing metal

should not be used in the microwave oven.

The Microwaves are reflected by the metal…

…they pass through Glass and Porcelain…

…and they are absorbed by the food.

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Whirlpool MWA 121/HA Instruction for Use Page 17

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