It is an Electronic oven designed for cooking most foods usually cooked in gas and electric range including foods commonly cooked on surface units. It is also used to thaw frozen foods, to heat leftovers, to warm the baby's bottle.
Microwaves themselves are the sources of energy and not the heat. Microwave cooking appliances heat only by radiation. In electronic ranges the microwaves penetrate the food, setting the food molecule in motion, an action that generates heat within the food and brings about the cooking results. The process is very rapid, two to ten times faster than the conventional methods depending upon the amount of food. In the conventional methods of cookery, heat is applied to the outside of the food. Pyrex glass and ceramic cookware (Corning ware) are used as dish materials.
The cooking process is very rapid.
1. Electricity is expensive.
2. Not suitable for quantity cookery.
FUELS AND OVENS
The more economical, convenient, clean and attractive the kitchen, the greater is the satisfaction it gives to the housewife. Wise selection of fuels and ovens help to conserve time and energy of the homemaker and induce economy in family finance.
Combustible substances used for the production of heat are known as fuels. They can be graded according to the amount of heat produced. No home or industry can exist without them. All fuels contain the basic combustible elements carbon and hydrogen along with non- combustible materials such as carbon-di-oxide and moisture.
Qualities of a Good Fuel
A good fuel should be
3. Easily storable and transportable
The products of combustion should be easily disposable.
TYPES OF FUELS
Fuels fall under three major categories solid, liquid and gaseous in their natural or prepared state. Fourth category is electricity and micro wave and fifth category includes solar energy.
Solid fuels : Natural : Wood, Coal
Prepared : Charcoal
Liquid fuels : Natural : Petroleum
Prepared : Kerosene
Gaseous fuels : Natural : Natural gas
Prepared : Coal gas, Acetylene,Biogas, Methane gas
Electricity and Microwave Solar energy.