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Unformatted text preview: Microwave Oven Nate Steiner MEC110 Basics A microwave oven works by taking microwaves, which cause the water in the atoms to rub against one another causing the atoms to get hot in the food you are preparing. The air in the microwave does not get hot because the water molecules in the air are too far apart in order to rub against each other Since the dishes don't have water in them they do not heat up like the food does. Metals reflect microwaves, which is why metal pans do not work well in microwave ovens. In a microwave oven, the microwaves evenly penetrate the food therefore cooking the food evenly. Inner Workings The oven takes electricity and collects it. These electrons are directed in a small metal wire that acts like an antenna. Around the metal wire is a metal ring, creating a "force field" of electrons. This whole assembly is packed between two very strong magnets. This is called a magnetron. The magnets create a magnetic field. The microwaves have a frequency of 2450 megahertz. Since water is polarized the molecules try to line themselves up. But since the electrical field is changing 2,450 million times a minute, the molecules don't have time to line up before they begin moving again. The metal box that is the outside of the microwave keeps the micro waves inside. Timer/electronic parts The timer and the controls on the outer part of the microwave oven work just like a computer. It takes input from the user and computes it to determine the amount of time or cooking level that you can chose. The timer is output on a very basic LCD screen Why get a microwave? You can make anything in a microwave. It only takes a fraction of the time to cook a meal. A microwave is a lot cheaper than an oven, and is more user friendly (no fire). ...
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- Fall '08