It is hard to imagine our daily life without the numerous electronic gadgets and tools. However, we are much less aware that electric and magnetic fields are formed everywhere electricity is present: including in the generation, transmission and distribution of electric energy.
As soon as a device is connected to an electrical outlet, it contains a voltage. An electric field is created even if the device remains switched off and no current flows. The voltage determines the intensity of the electric field and is measured in volt per metre (V/m). As the distance from the source increases, the strength of the field decreases.
Once current flows, a magnetic field is formed in addition to an electric field. The electricity volume transported through the line determines the strength of the magnetic field and is measured in microtesla (μT). As the distance to the line increases, the strength of the field decreases.
Electromagnetic spectrum – non-ionising radiation