I was not exactly the best studier in my class, when everything was explained, but I suddenly got interest in electrical engineering and now – how heaters are made.
I may not attempt to make one, before I educate myself a little. But it is just puzzling me and I cannot rest without knowing the answer – How are oven heaters made.
If you take a copper tube or kanthal/nichrome wire and give it a voltage so that they heat – isn't that short circuiting the voltage source?
How to determine what wattage is going to be needed to achieve the desired temperature? Let's say I want to achieve temperature levels up to 200o Celsium. This means the tube/wire itself must be somewhat hotter so that it provides this temperature in an area of say a pack of cigarettes.
I know that the diameter (thickness), the material, the length matter as well as the way they are formed – these factors are remotely related to the resulting resistance and wattage needed, but I am unaware of the right formulas to calculate them based on my expectations.