Electrical engineers design, develop, test and supervise the manufacturing of electrical equipment, such as electric motors, radar and navigation systems, communications systems and power generation equipment, states the U.S. Bureau of Labor Statistics. Electronic elements measure a mainly industrial product in a square, which can be obtained in an extremely verbal form and should not be confused with electrical components, this square measures abstract abstractions representing perfect electronic elements. Research, design, develop or verify electronic elements and systems for industrial, military or scientific use using data from electronic theory and the properties of materials. The electrical circuits and elements are used in fields such as telecommunications, region management and propulsion management, acoustics or instruments and controls. An element can also be classified as passive, active or electromechanical. The strict definition of physics treats passive elements as those which cannot supply energy themselves; while a battery would be considered an energy element because it actually acts as an energy source. Electrical devices are used in the health field, not only to aid in diagnosis and determination, but also to find treatments that cure illnesses. Equipment such as CT, MRI, X-ray, dental test equipment, blood tests, hemoglobin tests, etc., rely on electronic engineering in order to function properly.