Modelling of the Computer Classroom Electromagnetic Field

摘要

A modern computer represents a sophisticated system composed of several electric and radio electronic devices with different physical operation principles [1-9]. All equipment is arranged compactly in the power plants [1]. Simple electric devices use voltage they receive from an electricity network. Meanwhile more advanced equipment, such as displays, change the frequency, level and form of supply voltage depending on their functions [7]. For a display to function various frequencies and an electric current of different forms (sine, saw-toothed or rectangular impulses) are necessary and, therefore, electromagnetic fields of a wide-frequency spectrum are radiated [8].