Charge is either positive or negative. Good conductors are generally made of metal, although other substances such as the earth or the human body can be relatively good conductors. Conduits may be made of steel, aluminum, PVC or other materials. Conduits are permitted to act as grounding conductors for electrical circuits as provided by codes. The electric current in a wire is often compared to water flowing through a pipe.
Currents produce magnetic fields.
An electrical current that flows in one direction only. The strength of an electric field is a function of voltage and not of current. The force fields around an electric conductor that has voltage and current. A breakdown of electromagnetic fields according to their frequency and wavelength. ELF Extra, or Extremely low frequency field at the end of the electromagnetic spectrum, from 30 to 300 Hz.