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Shocking Signals   When you turn a light on or off, a small electrical spark will jump across the contacts inside the switch. This produces a tiny ‘blip’ of radio interference that you may hear as a click when listening to an AM broadcast. Something producing an electrical spark, like an electric motor, is a sort of a radio transmitter, but most appliances are suppressed to avoid interference with radio or TV. Very early radio transmitters used giant electrical sparks to create radio waves and the first signal across the Atlantic was created in this way.

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Friday 18 May, 2012

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