tic flux density, the polarity of the field, and the shape of the field. The strength of the magnetic flux density is controlled by the magnitude of the current flowing in the coil, the polarity of the field is determined by the direction of the current flow, and the shape of the field is determined by the shape of the iron core around which the coil is wound.electromagnets are used in lots of things. Motors are the most prominent example. Every electric motor uses at least one electromagnet. Most use two, one stationary and one moving. Sometimes one or the other of them is a permanent magnet. Generators, being the alter ego of motors, also use electromagnets. Loudspeakers and earphones use electromagnets to drive the diaphragm. Televisions use electromagnets to direct the electron beam on the screen. Scrap heaps use electromagnets to pick up large ferrous items like junked cars. Also fire doors as they can shut after detecting a fire the doors lock after a few minutes so people are safe outside and don t return back into the building.
REFERENCES
1. Лопти - Довідник з високоточним електричним апаратам
2. Буткевич Г.В., Дегтяр В.Г., Сливінська А.Г. Задачник з електричним апаратам. - М.: Вища школа, 1987. - 232 с
. таев І.С. Електричні апарати: Загальна теорія. - М.: Енергія, 1977. 272 с.
. Сахаров В.П. - Проектрірованіе електричних апаратів. Загальні питання проектування: Навчальний посібник для студентів електротехнічних вузів. - М.: Енергія, 1971. - 560 с.
. Буль Б.К., Буткевич Г.В., Годжелло А.Г. та ін Основи теорії електричних апаратів/За ред. Г.В. Буткевича. - М.: Вища школа, 1970. - 600 с.
6. Electromagnets design: Performance guide for the course design on the subject: "The fundamentals of electrical apparatuses theory" for the students of the speciality 8.092206 - " Electrical machines and apparatuses "/ Comp.: O. V. Blyznjakov. - Zaporihzhza: ZNTU, 2005. - 17 p.
