Microwave owen

Q What Are Microwaves?

Ans Microwaves Are Very High Frequency Waves  That Operate at 2450 Mhz.

At frequencies of 2.45 Ghz, MWs are absorbed by water, sugar and fat  molecules and converted into atomic motion.

At these frequencies, MW are not absorbed by plastics, ceramics etc. and reflected by metals

Q How Do Microwaves cook ?

1) In a Microwave oven, a Magnetron tube emits the MWs.

2) These Microwaves pass through the food.

3) The water molecules in the food begin to oscillate.

4)The oscillation generates heat energy due to friction.

5) The heat generated hence cooks the food particles nearby.

Comparision Conventional Gas Vs Microwave Owen

CONVENTIONAL GAS

1) Layer-by-layer, Outside to inside.

2) Spoils the kitchen wall with sprinkling of oil.

3) Separate utensils for cooking & serving.

4) More usage of Oil/Ghee.

5) More time consuming & tiring.

6) Nutritional Value of the food is
lost due to longer cooking.

7) Installation Cost Is low But Operating cost is more.

8) Easy to use for Normal Person.

MICROWAVE OWEN

1) Same utensils can be used to cook & serve.

2) Less time consuming & enjoyable.

3) Less Oily food.

4) Cooking through Water molecules.

5) Even cooking, inside to outside.

6) Non- messy , more neat & clean kitchen walls.

7) Nutritional Value of the food is
preserved.

8) More Complex To use Microwave Oven.

9) Consumes Large Electricity Power.

10) Installation Cost Is More But Operating Cost Is less.

DIAGRAM OF MICROWAVE OWEN.

PARTS OF MICROWAVE OVEN.

1) MAGNETRON
2) STEP UP TRANSFORMER
3) TURN TABLE MOTOR
4) FAN
5) HIGH VOLTAGE DIODE
6) HIGH VOLTAGE CAPACITOR
7) RELAY
8) FUSE
9) THERMOSTAT.
10) PCB
11) WAVE GUIDE
12) TABLE STAND
13) Element ROD

VIDEOS TO WATCH FOR MICRO OWEN REPAIRING

2) 

HIGH VOLTAGE TRANSFORMER

The high voltage transformer solves a very specific problem. Unique among household appliances, a microwave oven actually requires more power than the normal voltage that your home's electrical wiring produces.

In order to solve this issue, the microwave oven uses a very specific device called the high voltage transformer. The transformer's function is to magnify the power available to the oven from the home's wiring to the level necessary to produce microwaves.

Essentially, the high voltage transformer is a series of capacitors. These capacitors loop the flowing electrical current to make it much more powerful – usually around 3000 volts from the normal 115 volts of household electricity in the United States.

2 ) MAGNETRON TUBE

When the electricity's voltage has been amplified sufficiently, it's then passed on to the magnetron tube. This is the part of the microwave oven that converts the electrical current into microwave energy.

This specially-made diode uses magnetic fields to control electrons. As the electrons pass through the diode, they heat up a filament, thus causing electrons to split off in the form of microwave energy.

3) WAVE GUIDE

Once the microwave energy is created, a device called the wave guide then channels and directs the microwaves into the cooking chamber. The microwaves then bounce off the inner walls of the oven while passing through the food or drink on the turntable or platform.

The Cooking Cavity and the Frame

The microwave energy produced by microwave ovens can be quite dangerous to humans. That's why microwave ovens utilize a deep cavity for cooking – any substance you want to heat or cook is placed inside this cavity.

When the door to the oven is shut, the frame of the oven forms a box around the cavity, which keeps all the microwaves inside this sealed box. The oven door is covered by a thin metal grid with tiny holes. These holes are too small for any microwaves to pass through, but allow the user to see into the cooking cavity to ensure the food or drink is heating properly.