![]() Magnetic fields are measured in microteslas (μT, or millionths of a tesla).Įlectric fields are produced whether or not a device is turned on, whereas magnetic fields are produced only when current is flowing, which usually requires a device to be turned on. The strength of a magnetic field decreases rapidly with increasing distance from its source. Electric fields are measured in volts per meter (V/m).Ī magnetic field results from the flow of current through wires or electrical devices and increases in strength as the current increases. As the voltage increases, the electric field increases in strength. Electric and magnetic fields are invisible areas of energy (also called radiation) that are produced by electricity, which is the movement of electrons, or current, through a wire.Īn electric field is produced by voltage, which is the pressure used to push the electrons through the wire, much like water being pushed through a pipe.
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