That is the reason for specifying to rotate the pans midway during baking. But, in this conventional method of heating, the movement of heat is not so fast that there are plenty of hot spots. So, when turned on, heat moves from bottom to top. Meaning, there are one or two heating elements.
Otherwise, when the temperature reaches 500F, it shuts off the oven. When you do turn on the broiler, if you are using an electric oven, you have to leave the door ajar. Example is you can brown the custard or meringue by turning on the broiler for few minutes. Broiling is used to quickly get the nice roasted crust for some dishes (they are placed very close to the coil or heating element so they brown fast) or to brown the top layer to make it look pretty. When you turn the broiler on, only the top heating is turned on. Now, what is broiler? When you turn on the oven to bake, only the bottom heating is turned on. What this means is if you are using a gas oven, broiler is in the rack below the oven. Gas ovens have the openings for gas and to burn in the bottom only. Most of the electric ovens have coil that heats up on the roof and on the floor. There are racks to place the food trays in it. It has heating elements either on the floor or on both the roof and the floor. This is the same concept behind the construction of ovens. It is simple - every 2nd grader probably knows about this. It travels up or floats up and the water above sinks in and gets heated. When the water is heated, water directly next to the bottom of the pan gets heated first. Have you thought about how water is boiled? Process is called ' convection'. But, this is my humble attempt to explain what I know about ovens in the simplest terms possible. Now, I don't consider myself an expert in talking about every single oven that is out there. One such email came from one of the readers which said, "I am new to using an oven. They send me emails, requests, encouraging words and stuff about food or contents of this blog. I have that kind of connection with many people whom I have never seen nor I ever will see. It is different probably because you are not biased about that person. When you don't know someone personally, there is a different kind of connection with them.
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