<P> In the United States, the 1982 Public Law 97 - 259 allowed the Federal Communications Commission (FCC) to regulate the susceptibility of consumer electronic equipment . </P> <P> Potential sources of RFI and EMI include: various types of transmitters, doorbell transformers, toaster ovens, electric blankets, ultrasonic pest control devices, electric bug zappers, heating pads, and touch controlled lamps . Multiple CRT computer monitors or televisions sitting too close to one another can sometimes cause a "shimmy" effect in each other, due to the electromagnetic nature of their picture tubes, especially when one of their de-gaussing coils is activated . </P> <P> Electromagnetic interference at 2.4 GHz can be caused by 802.11 b and 802.11 g wireless devices, Bluetooth devices, baby monitors and cordless telephones, video senders, and microwave ovens . </P> <P> Switching loads (inductive, capacitive, and resistive), such as electric motors, transformers, heaters, lamps, ballast, power supplies, etc., all cause electromagnetic interference especially at currents above 2 A . The usual method used for suppressing EMI is by connecting a snubber network, a resistor in series with a capacitor, across a pair of contacts . While this may offer modest EMI reduction at very low currents, snubbers do not work at currents over 2 A with electromechanical contacts . </P>

Interference produced by microwaves and cell phones is an example of