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What is an ElectroMagnetic Field (EMF)? August 17, 2006

Posted by healthyself in 60 Hz Magnetic Fields, Blogroll, Cell phone safety, Electromagnetic pollution, Electrosensitivity, Electrosmog, EMF's, High Frequencies, high voltage transmission lines.
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Electromagnetic fields are invisible to the human eye, and are present everywhere in the environment. They are defined by frequency, or wavelength–the higher the frequency the shorter the wavelength.

Electric fields are related to the presence of voltage, and are present even when current is not flowing. They are present around household electrical appliances, computers and printers etc. They are measured in voltage (V/m) which is volts per meter.

Even when an appliance is turned off, the electric field is present as long as it is connected to a power source (plugged in.) The field increases in strength as you get closer to the appliance, energized wire or power line. They are easily shielded.

Magnetic fields are only present when the current is flowing through a wire or a conductor. Magnetic fields are measured in milliGauss (mG). Magnetic fields increase as the amperage (current) increases or as you get closer to the current. Magnetic fields pass through objects and are difficult to shield. However, they are not present when the current is turned off.

Humans have reported tingling feelings when near a strong power source from the electric field; however, humans can not feel the magnetic fields because they pass right through the body.

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