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Electrical engineers is a field of engineering that generally deals with the study and application of electricity, electronics and electromagnetism. It now covers a range of subtopics including power, electronics, control systems, signal processing and telecommunications. The main aim is to ensure the safe usage of electricity. For this purpose they are given the responsibility of designing electrical appliances as well as the wiring system of electricity to ensure supply of electricity to these appliances. Electrical engineers are concerned with designing the flight systems of aircrafts and rocket propulsion systems. Industrial automation and automobile control system design are also a part of electrical engineering. Electrical engineering has an important role to play in many other fields of study. For instance, signal processing makes use of the principles of electrical engineering in modifying the digital and analog nature of the signals to obtain the required output.