Differences in voltage produce electric fields: the higher the voltage, the stronger the resultant field. Magnetic fields are formed when electric current flows: the greater the current, the stronger the magnetic field. Even when no current is flowing, an electric field will still exist. If current flows, the magnetic field strength will vary with power consumption, but the strength of the electric field remains constant.
Natural sources of EMF
Although the human eye cannot see EMFs, they exist everywhere in the environment. Electric fields are created by the local build-up of electric charges in the atmosphere related to thunderstorms. While the magnetic field of the earth causes a compass’s needle to orient in a North-South direction, the birds and fish utilise the magnetic field for navigation.
Human-made sources of EMF
In addition to natural sources, the electromagnetic spectrum includes fields created by human-made sources, such as X-rays to diagnose broken limbs after sports accidents. There are low-frequency electromagnetic fields associated with the electricity that comes out of power sockets. Information is also transmitted using a variety of higher frequency radio waves. In today’s world, electromagnetic (EMF) Radiation is everywhere. Many types of equipment in the home or office environments, intentionally or unintentionally, generate EMF. Such equipment includes televisions, mobile phones, modems, personal computers and microwave ovens.
All are powered by electricity, which itself creates EMF. High levels of EMF are found in our surroundings.