An electric field is an invisible force field created by the attraction and repulsion of electrical charges (the cause of electric flow), and is measured in Volts per meter (V/m). The intensity of the electric field decreases with distance from the field source. A static electric field (also referred to as electrostatic field) is an electric field that does not vary with time (frequency of 0 Hz). Static electric fields are created by electrical charges that are fixed in space. They are different from fields that change over time, such as electromagnetic fields generated by appliances using alternating current (AC) or by cell phones etc.