Electrical fields are made by voltage and increase as the voltage intensifies. The strength of the electric field is quantified in units of volts per meter. Electric fields diminish rapidly the further you get away from the source. Magnetic fields result from the stream of current through wires or electrical devices and increase as the current surges.
Magnetic fields are calculated in units of Gauss or Tesla. Gauss is the most utilized in the United States, and Tesla is the internationally recognized term. An electric field, unlike a magnetic field, is only made when the current is flowing. Magnetic fields also decrease rapidly and are not as easily shielded as electrical fields.