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An oven heats objects inside of a chamber, a furnace heats the air around it.
An electric double oven and an electric single oven would have about the same capacity. The only difference between the two is that you can cook two things at the same time with different temperatures using the double oven. It may even heat up faster as well.
A stove includes and oven and has the cooktop as well. The cooktop is separate and is typically on a kitchen counter space and is most likely going to be electric. With a stove, you could have the option of electric or gas.
A convection oven moves the air, a microwave does not.
A convection oven moves the air, a microwave does not.
a salamanda is a grill -heats from top oven all around
No, since you will be using the same pan it wont matter.
The benefits of using a double electric oven are that it is energy efficient, it is easy to install, the cooking temperature is constant, and finally it produces dry heat, which is very beneficial to certain foods.
The biggest difference between an electric grill and a griddle is the cooking surface. An electric grill has raised ridges and an electric griddle has a flat surface. Typically a grill is used to cook meats, while a griddle is used to cook pancakes french toast, or bacon and eggs.
In UK voltage, a single oven would use somewhere between, 10-15 amperes and a double oven, 30-40.
An electric oven is safer, however it can cost more than a gas oven. It's a matter of preference.
In simple words, autoclave is a pressurized oven.