Each term is linked to the most relevant page of this site.
a-b | c | d-f | g-j | k-m | n-p | r-s | t-z
Gauss A unit of magnetic field still used in the USA. 10,000 G = 1T
H Usual abbreviation for the magnetic field strength
Hall effect A way of measuring magnetic fields. A current in a suitable semiconductor experiences a sideways force, in turn creating a measurable voltage, proportional to the magnetic field.
Harmonics. Multiples of the basic frequency. If the power frequency is 50 Hz, second harmonic is 100 Hz, third harmonic is 150 Hz, etc.
Herz (symbol Hz) The unit of frequency, 1 Hz = 1 cycle per second
HSE The Health and Safety Executive
Human Radiation Effects Group A research group in the Physics Department at Bristol University, led by Professor Henshaw, active on EMFs
IARC International Agency for Research on Cancer. An agency of the WHO based at Lyon. One of their activities is to classify agents as to whether they are a cause of cancer
ICNIRP International Committee on Non-Ionizing Radiation Protection. Among other activities, they publish recommended exposure guidelines.
IEC International Electrotechnical Commission, an international standards organisation
IEE formerly Institution of Electrical Engineers, now IET, Institution of Engineering and Technology (UK based)
IEEE Institution of Electrical and Electronics Engineers (USA based)
IET Institution of Engineering and Technology (UK based)
Induction The process whereby an alternating field (either electric or magnetic) creates a current in a conducting object
Institute of Occupational Health A research group at Birmingham University who are active on EMFs
Inverse square, inverse cube Ways of describing how rapidly fields fall with distance from the source
IOH see Institute of Occupational Health
Ions Molecules that have had electrons stripped off them or added to them, so have a charge. Ions are usually either air ions or ions in solution such as in cells.
IRPA International Radiation Protection Association, predecessor body to ICNIRP (IRPA still exists but created ICNIRP as a separate body)
j symbol often used for current density