So what is electromagnetic radiation?

» Is electromagnetic radiation is around us?

» I can't see electromagnetic radiation - how do I know where it is?

» What is EMI (electromagnetic interference)?

Is electromagnetic radiation all around us?

All modern electronics emit electromagnetic radiation. Radio waves, microwaves, visible light, and x rays are all examples. Electromagnetic waves are produced by the motion of electrically charged particles. These waves are also called "electromagnetic radiation" because they radiate from the electrically charged particles. They travel through empty space as well as through air and other substances.

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I can't see electromagnetic radiation - how do I know where it is?

The internal circuits of personal computers generate EM fields. Also, cathode ray tube (CRT) displays generate EM energy over a wide band of frequencies. As do mobile phones. To prove this simply place a radio receiver of any kind and use it at the same time as you use your personal computer, or mobile phone and you will probably hear RF noise in the receiver that originates in the computer or from the phone.

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What is EMI (electromagnetic interference)?

EMI (electromagnetic interference) is the disruption caused by an electromagnetic field. This is why mobile phones are not allowed to be used in hospitals, aeroplanes or petrol stations. The EM radiation emitted from them can interfere with sensitive equipment and poses a danger to safety.

EMI was traditionally used to describe how one EM field emitted from one electronic device effects the operation of another electronic device, EMI can now also be used to help explain the ways in which EM radiation effects living things.

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