EXPERIMENT: THE ELECTRIC BELL
The electric bell is a closed circuit operated by a switch
which produces sound by means of an electromagnetic process.
The electric bell consists of: one swtch, one 4.5 V battery, two
soft iron bolts with nuts, four soft iron screws with nuts, two
iron tongues,
one bicycle bell, some wood supports for the bolts and the screws,
enameled wire, unipolar wire , a plywood board.
To build an electric bell you have to:
-
pull the unipolar wire through the switch and
fix it to the plywood board
-
place and fix the battery leaving space
for the other components
-
wind the enameled wire around the bolts
-
fix the
bolts to the board using one of the wood supports, leaving space
for the iron tongues and the
bell
-
connect one end of the enameled wire and
one end of the unipolar wire to the
battery
-
fix the four screws. Two screws
will support the two iron tongues,
the other
two will
touch the first iron tongue
-
fix
the two iron tongues with two screws (one of them will
be shaped to
close the
circuit)
and connect .the enameled
wire. At
the end of
the second iron tongue (which
is connected to the first)
there is
a screw which
works as a
hammer.
-
place the bell so
that the longer tongue can hit
the bell
-
make sure the
two bolts are close enough
to the iron
tongue
with the
hammer, and that
the
two screws are fixed
to the shorter tongue.
The circuit is closed
by a switch which
operates the
electromagnet.
modello
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