The introduction of electrical power in the human environment was relatively slow in its early beginnings, i.e. when the first industrial electrical generators were built following Nicholas Callan's invention of the induction coil in 1836. The first generators of the 1880's were installed to convert mechanical energy collected from water falls into direct current to power nearby manufacturing plants connected to primitive power lines.
This was then. Today we are surrounded by waves of electrical signals of all kinds in frequency and power. The health effects of such activities are sometimes obvious. Electrocution, for example, accounts for approximately 20% of all construction accidents.
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Radio-frequency and cellular phones
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