ELF fields generally have frequencies up to 300 Hz. The effects of electromagnetic fields on the human body depend not only on their field level but on their frequency and energy. These fields induce currents within the human body, which if sufficient can produce a range of effects such as heating and electrical shock, depending on their amplitude and frequency range. Electromagnetic Fields at High Frequencies Mobile telephones, television and radio transmitters and radar produce RF fields. These fields are used to transmit information over long distances and form the basis of telecommunications as well as radio and television broadcasting all over the world.
Microwaves are RF fields at high frequencies in the GHz range.
In microwaves ovens, we use them to quickly heat food. Frequency and wavelength describe an electromagnetic field. Photons of electromagnetic waves at power and radio frequencies have much lower energy that do not have this ability. Magnetic fields arise from current flow. At radio and microwave frequencies, electric and magnetic fields are considered together as the two components of an electromagnetic wave.