What Is the Difference Between a 900-Watt Microwave and a 1000-Watt Microwave?

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The main difference between a 900-watt microwave and a 1000-watt microwave is how long it takes to cook food items. According to Microwave Cooking For One, it normally takes a 900-watt microwave longer to heat up something than a 1000-watt microwave.