These fields are a normal part of both the delivery of electricity across a power system and the use of electricity in our homes. To help you better understand some of the issues around EMFs, we have put together answers to frequently asked questions about EMFs.
What are electric and magnetic fields?
Electric and magnetic fields (EMFs) are invisible lines of force that surround any electrical device, such as power lines or the electrical cables in your home. They are created whenever electricity flows through a wire.
Where do EMFs come from?
Most EMFs are produced by human activities, but some occur naturally. The most common natural source is the magnetic field of the earth itself. Another source of natural electric fields is high voltage lightning flashes during thunderstorms and electrical storms. Televisions, radios, computers, mobile cellular phones, microwave ovens, and high voltage power lines also produce EMFs.
What is the difference between an electric field and a magnetic field?
Electric fields are formed whenever a wire is plugged into an outlet and remain present even when an appliance is not turned on. The higher the voltage, the greater the electric field.
Magnetic fields are formed by the flow of current through wires or electrical devices. The greater the current, the higher the magnetic field.
How can I determine if there are EMFs present?
EMFs are present everywhere there is electricity. On a daily basis, Canadians are exposed to EMFs generated by household wiring and any electrical appliance that plugs into the wall. Electric fields exist whenever equipment is plugged in, but magnetic fields exist only when equipment is turned on. Both types of fields get weaker with distance from their source.
Are there health risks associated with EMFs?
For more than 30 years, a great deal of research has been conducted about EMFs and health. To date, health agencies and a large number of reputable scientific organizations around the world have concluded that the scientific research does not demonstrate that EMFs cause or contribute to adverse health effects. Some scientific questions remain the subject of ongoing research.
Where can I get more information about EMFs?