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The Microwave Oven

bryson avatar
bryson
17 diapositives · 725 Views · Jan 09, 2013

The Microwave Oven. Introduction. The Microwave Oven. Form of energy that travels like radio waves Magnetron (MAG-nuh-trahn) tube turns electricity into microwaves Microwaves are distributed throughout the oven by a stirrer blade which is a fan like device

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The Microwave Oven
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  1. The Microwave Oven Introduction

  2. The Microwave Oven • Form of energy that travels like radio waves • Magnetron (MAG-nuh-trahn) tube turns electricity into microwaves • Microwaves are distributed throughout the oven by a stirrer blade which is a fan like device • Microwaves bounce off the oven’s walls and floor until they are absorbed by food • Microwave energy is reflected from metal but will pass through glass, paper, and plastic

  3. Invention of the Microwave • All started one morning in 1945 • Dr. Percy Spencer • Scientist • Working in his lab • Felt heat on his hands • Microwaves • Placed a chocolate bar where the heat was located • Within seconds the chocolate melted • This was the beginning of the idea of using microwaves in cooking

  4. Parts of the Microwave • Door • Metal wire mesh • Allows you see but the microwave can not get out

  5. Parts of the Microwave • Magnetron Tube • Changes electricity to microwave energy • Looks like a radio or TV tube • Should last for 3,000 hours of use • (10 years)

  6. Parts of the Microwave • Cavity • The inside of the microwave • Stainless steel • Glass tray on the bottom

  7. Parts of the Microwave • Fan • What you hear when the microwave is running • Helps cool the magnetron tube

  8. Parts of the Microwave • Stirrer • Looks like a fan • Moves the microwave around the cavity

  9. Parts of the Microwave • Wave Guide • A pipe that carried the microwaves from the magnetron tube to the cavity

  10. Power Levels • 100% • Tube is producing microwaves the entire time • 50% • in one minute the magnetron tube is only working for 30 seconds

  11. Hot Spots Microwave are not sent through the stirrer evenly throughout the microwave The turntable will help with even cooking

  12. Experiment with Hot Spots 1.Place a Piece of wax paper on the bottom of the microwave covering the entire surface 2.Place 5 marshmallows on the wax paper One in each corner One in the center 3. Turn Microwave to 100% Power 4. If the stirrer is sending out even microwave the marshmallow will all grow at the same rate and size 5.Marshmallows that get big first are the hot spots in your microwave

  13. Microwavable Containers • Microwave will pass through • Glass • Plastic • Paper • Wood • Straw

  14. Microwaveable Containers • DO NOT USE METAL IN THE MICROWAVE

  15. Standing Time • Food continues to cook when removed from the microwave • Cook foods until just almost done • Remove • Let stand until they are finished cooking

  16. Cook Times • Most foods cook in the microwave in 1/3 of the time

  17. Help with food cooking • Stir Foods • Place in circular formation