Easily put, an electron is a subatomic particle that carries a negative electric charge. There are no known components, so it is believed to be an elementary particle(basic building block of the universe). The mass of an electron is 1/1836 of its proton. Electrons have an antiparticle called a positron.
Double Oven Average Costs . Double ovens start at around $1,250 to $2,500 and can cost as much as $4,000 to $5,000 or more. Professional installation of a double oven might cost $100 to $200 (or more, if cabinet alteration is required). To make installation as easy as possible, look for a double oven that's the same size as your old oven.
Double or single ovens. What do you need? Single ovens are a great choice if space is tight, if you tend to cook for one or two or don't cook much for pleasure. Single ovens are about 60cm tall and can be slotted under-counter or at eye-level. Remember, though, you won't be able to cook and use the grill at the same time. Double ovens offer more versatility and are good for families. Electric cookers, where the main oven is fan or multi-function, have a smaller, traditional second oven. Make sure you can fit some of your popular weekday cookware in it; some second ovens tend to be very shallow.