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The inside view of a microwave oven shows a magnetron tube connected to a transformer. The transformer connects to a 115 V source from outside, amplifies it to 4000 V and feeds to the magnetron which then releases microwaves. These waves are rebounded within the cavity with the help of a suspended stirrer, and the food items placed inside the cavity are cooked. A metal screen at the door and interlock switches ensure that the waves are contained within the cavity.