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High voltage
Place a flat
baking tray on a dry glass, rub a blown-up balloon vigorously on a woollen
pullover and place it on the tray. If you put your finger near the edge of the
tray, a spark jumps across. A voltage equalisation occurs between the metal and
the finger. Although the spark is discharged with several thousand volts, it is
just as harmless as the sparks produced when you comb your hair. An American
scientist discovered that a cat’s fur must be stroked 9,200.000.000 times to
produce a current sufficient to light a 75-watt bulb for a minute.
why does it work?
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