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The following rules and practices are not covered in the instructions for using the microwave oven. If you know and understand how microwave ovens work below, we guarantee that you will no longer use the microwave as before.
The 10-second rule
Microwave turntable rotates every 10 seconds. As you follow the instructions for the microwave oven manual, you will know how to adjust the speed accordingly. Viewing the rotations per minute of microwave carousel operation is most evident when heating a drink in a cup or drink with handles. If you place a cup of water or coffee directly in front of, between the center and the edge of the turntable, and reheat for 15 or 25 seconds, the cup will be on the back of the microwave.
Rule 0 or 5
When the 10-second rule matters, you should think about reheating food and drinks by multiples of 10 or the 10-second interval plus or minus 5 seconds.
If you want the reheated item to stay in place after shooting then you need to make sure the end time is 0 (10, 20, 30…).
If you want the heating item to be on the opposite side of the oven chamber after spinning, make sure the end time is 5 (5, 15, 25…).
For example, let’s say you are heating a coffee cup with a handle. To remove the coffee cup without burns, place the cup in front with the handle facing you and rotate for x0 seconds the cup will return to the handle facing you. It’s the coldest part of the cup and safest to the touch.
Alternatively, you can place the cup on the back, with the handle facing away from you and use x5 seconds to heat the cup. Once turned, the handle of the cup will be facing you. At this point, the cup can be easily removed.
Rotary table motors determine 1 rpm (RPM)
Your microwave’s turntable drive synchronous motor will be rated at 5-6 revs per minute, equivalent to 50-60Hz. These are not specifications that the microwave manufacturer will provide, but can be seen by looking at the many replacement motors available online for repair.
In the US, generating stations use 60Hz as the rated current frequency for the alternating current (AC) you use indoors. So the engine will use 6 rpm and 60 seconds divided by 6 revolutions is the 10 second interval.
In Vietnam, the region’s main frequency might be 50Hz, then 5rpm will be used and that doesn’t follow the rule for numbers ending in 0 or 5. A full spin would be 12 seconds, so you have to think about the 6-second interval for full (12, 24, 36, etc.) or half (6, 18, 30, …).
For example, some GE microwaves use motors with speeds of 3 rpm at 60 Hz. That speed is as slow as half a rpm, so a full rotation of the turntable takes 20 seconds, not 10. Instead of using numbers ending in 0 or 5 for accurate timing, you’ll use only alternating multiples of 10, where 10, 30, 50 seconds place items opposite where they were placed, and 20, 40, 60 seconds to return to their original position.
Some microwaves also use a 10 rpm motor at 60 Hz, but it’s uncommon.
Most microwaves will follow the rule where the zero end time is one full rotation and the end time 5 is half a revolution. But it all depends on which engine your appliance uses for the glass plate to swing your food and drinks around.
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