At 50% power, the magnetron will generate microwaves at 50 percent of the selected time. Therefore, during the off cycles, the energy accumulated will warm the food by conduction. Cooking at medium or 50% power is perfect for slow cooking and braising. To set the microwave at 50% power, you need to press the numbers 5 and 0. Once done, press the start button and the microwave will turn on and begin cooking the food.