wer line fields. Some appliances also produce both 60 Hz and higher frequency fields. For example, video displays such as TV sets and video display terminals (VDTs) used with computers produce radio frequency fields as well as ELF fields (Bioelectromagnetic, 1996).
EMF Factors influencing Human Health
Strong electric fields, such as those found beneath large
transmission lines, can also cause nuisance shocks from voltages created by EMFs on objects like metal fences. AC fields create weak electric currents in the bodies of people and animals. This is one reason why there is a potential for EMFs to cause biological effects. Currents from electric and magnetic fields are distributed differently within the body. The amount of this current, even if a person is beneath a large transmission line, is extremely small, measured in millionths of an ampere. The current, which is too weak to penetrate cell membranes, is present mostly between the cells (American National Standards Institute, 1996).
Currents from 60 Hz EMFs are weaker than natural currents in the body, such as th
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