Scientific explanation:
An electric current only
flows if it can get from one end of the battery (the negative pole) on the
other end (the positive pole). Only then does it for example produce light.
The current consists of tiny small particles called electrons: The battery
sets them in motion as soon as the electric circuit run is closed.
By the way: All metals
conduct electric currents. The bell wire is surrounded by a plastic cover, in
order to prevent that a current flows accidentally, when two wires touch by
mistake.
Description of the light
circuit:
With a paper clip or tape
the bell wire is fastened onto the minus pole of the battery. The other end
is fixed on a wooden plate with a thumbtack and brought in contact with a
paper clip. One half of the "circuit" is finished.
Another wire is fastened to
the other pole of the battery and led to the bulb, the copper wound around
the metallic mounting. Now a second wire is attached at the lower part of the
mounting with tape and led to the switchboard which is already equipped with
a wire and a paper clip. The end of the wire arriving there is likewise
fastened with a thumbtack on the plate and brought into contact with a
metallic paper clip. A third paper clip serves as "switch": As soon
as it brings the two other clips, which are connected to the wire ends, in
contact, the current can
flow: The light turns on!
The bell:
The bell works in exactly
the same way. Instead of a small lamp one uses a small bell and fastens the
wires to its metallic end.
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