Electric and magnetic fields (EMF) are invisible lines of force that surround any electrical device. Electrical wiring, electrical equipment and power lines all produce electric and magnetic fields. Electrical fields and magnetic fields can be characterized by their wavelength, frequency and amplitude (strength). The wavelength describes the distance between the peak of one wave to the peak of the next wave. Frequency is the number of wave cycles per second measured in Hertz (Hz). Electricity in the United States alternates or changes direction at 60 cycles per second or 60 Hz. In many other parts of the world the frequency […]