Manual Teka TMW 18 BIG (page 32 of 72) (English, German, French)

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Advantages of the microwave oven

In a conventional cooker, the heat that is radiated

through the resistances or gas burners slowly

penetrates the foods from the outside in.

Therefore, there is a great loss of energy in

heating the air, the oven components and the

containers holding the food.

In the microwave, the heat is generated by the

foods themselves, i.e. the heat goes from the

inside out. There is no loss of heat to the air, the

walls of the cavity or the containers (as long as

they are microwave-safe containers). This means

that only the food is heated.

To sum up, microwave ovens have the following

advantages:

1. Savings in cooking time; in general, there is a

¾ reduction in time compared to conventional

cooking.

2. Ultra fast defrosting of foods, thus reducing the

danger of bacteria developing.

3. Energy-saving.

4. Conservation of the nutritional value of foods

due to the reduction in cooking time.

Microwave oven operating mode

The microwave oven contains a high voltage

valve called a Magnetron, which converts the

electrical energy into microwave energy. These

electromagnetic waves are channelled towards

the inside of the oven by a wave guide and

distributed using a metallic disperser or a rotating

plate.

Inside the oven, the microwaves are propagated

in all directions and reflected by the metallic walls,

thus uniformly penetrating the foods.

Why the food is heated

Most foods contain water and the water molecules

vibrate with the microwaves.

The friction between the molecules generates

heat, which raises the temperature of the foods,

defrosting or cooking them or keeping them hot.

Because heat is formed inside the foods:

The foods may be cooked without any liquids

or oils, or with very little of these;

Defrosting, heating or cooking in the

microwave oven is faster than in a

conventional oven;

The vitamins, minerals and nutritious

substances are conserved;

Neither the natural colour nor the aroma are

altered.

The microwaves go through porcelain, glass,

cardboard or plastic, but not trough metal. For this

reason, metallic containers or containers with

metallic parts should not be used in the

microwave oven.

Microwaves are reflected by metal...

... they go through glass and porcelain...

... and are absorbed by the foods.

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Teka TMW 18 BIG Manual

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