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Why-is-m-microwave-taking-longer-to-heat-food, make sure that there are no air obstructions around the microwave case. magnetron tubes generate heat which must be removed by air flow. if the heat is not removed, the magnetron tube will cycle off and stop cooking.. I just moved to a house, my old microwave oven started to take longer to heat up the food at the new house, i thought buying a new microwave would be the best option but my new microwave oven is taking a long time to heat up the food too., the magnetron is wearing out. still the most efficient way to generate power at 2.45ghz, the magnetron, a vacuum tube, is used in all microwave ovens..

You may have noticed that the ads for microwaves say things like "cooks in a fraction of the time of a conventional oven." and they're usually smaller than a conventional oven., i have a smeg convection oven that i bought last year, cost about $600 if i remember. i think it was a smc30x 900w. now, in all honestly, it is not very good. i. My microwave takes much longer to heat things up - answered by a verified appliance technician, because air is a good insulator the thing that limits how fast a normal oven can heat something up is basically how fast the energy is transferred from the hot air to your food. the oven is powerful enough to keep the air hot, so adding another cake will not slow it down much. a microwave on the other hand is very efficient at transferring energy from the magnetron (the thing


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