| Health pamphlet
sample What's an electromagnetic field? A lamp plugged into a wall is connected to electricity that creates two kinds of fields. One is electric. The electric field is always there, whether you've turned on the lamp or not. It doesn't travel well through objects like walls. When you turn on the lamp, you let current flow to it. The current creates a magnetic field. A magnetic field can travel through most objects, including walls, although it gets weaker with distance. Electromagnetic field (EMF) is another term for the magnetic field created by electric current. Only alternating current produces EMFs The wiring in American homes carries alternating current (AC). The current "alternates" because it switches directions rapidly--60 times per second. This constant reversal creates a magnetic field. Battery-operated gadgets use direct current (DC). This kind of current doesn't produce the kinds of magnetic fields that concern researchers. Where am I exposed to EMFs? In your home If your home is close to power lines or its wiring is faulty, you could be exposed to a constant electromagnetic field. When you turn on an appliance, the appliance creates an electromagnetic field. If you're close to the appliance, the field goes through your body. At work If you work with computers or machinery, you might work in strong electromagnetic fields. The building you work in might also be near power lines or have high-voltage lines running through it and creating EMFs. At school Power lines, school wiring, computers, and many other sources can create strong EMFs in a school or daycare. Outside Overhead power lines can create strong fields. When you ride in a electric-powered train, you ride in an electromagnetic field. And the earth itself produces an electromagnetic field, but it's not the kind suspected of health damage. What happens when I'm exposed to EMFs? Your body already has its own electric current, from the work of your brain and heart. An electromagnetic field creates another current in your body. The current from an EMF is a lot weaker than your natural current, but laboratory studies have shown it could change processes in your body. Laboratory studies suggest that EMFs can
How are EMFs measured? |
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