The federal agency responsible for regulating communications in the USA.

A segment of the electromagnetic spectrum. ELF includes frequencies in the range 30-300 Hz (particularly high wavelengths, from 1000 to 10000 km, respectively).  Frequencies of the electric power grid are generally 50 or 60 Hz.  Examples of ELF electromagnetic fields: electric power lines, transformers, electric chargers, etc.)

A threshold value protecting the public from irreversible harmful effects of a chemical or physical agent.

A branch of medicine that deals with the distribution of states of health and disease in the population, and with the detection of risk factors and causation of diseases

A derivative of the general exposure threshold, aimed at protecting the environment and humans in public areas against the harmful effects of a chemical or physical agent.In certain cases the purpose of this threshold is to minimize exposure before irreversible damage is caused.

Any exposure to electromagnetic radiation that is not occupational or medical.

The ability of a system to perform work. Energy is one of the basic characteristics of any system.  Energy may be converted from one form to another, e.g., mechanical to electrical energy.

Negatively-charged basic particle in the atom.

A continuous scale of frequencies (or wavelengths) describing different types of electromagnetic radiation.  It ranges from the lowest frequency (corresponding to the longest wavelength) and to the highest frequency (corresponding to the shortest wavelength).  The scale is divided into segments of different frequencies according to their actual usage, their physical features, and their possible health effects.

The energy of magnetic electrical activity spreading in waves in a vacuum or through matter.