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Cut out a circle (r = 4.5 cm) and
a rectangle (5 cm x 10 cm)
Attach the bare wires to the DC
output. Turn the voltage to 0 and
turn on.
Roll the rectangle into a cylinder
around a board pen and create a
cone from the circle.
Put your ear to the cone and
slowly increase the voltage. DO
NOT LEAVE ON FOR LONG!
Wrap 1 m of wire around the
cylinder with 8 cm free at each
end. Take out the pen.
Attach the wires to the AC
output. Turn the voltage to 0 and
turn on.
Tape the cone to the cylinder.
The cylinder should move freely
on top of the magnet.
Put your ear to the cone and
slowly increase the voltage. DO
NOT LEAVE ON FOR LONG!
Making a speaker
Tightly wind 60 cm of insulating
wire around a board pen.
Straighten the free ends so that
they are perpendicular to, but in
the same plane as the coil.
Leave 2-3 cm of free wire at both
ends. The free ends of the wire
should be 180
o
apart.
Check the balance by spinning
the coil by the axles between
your thumb and index.
Remove the coil and w
rap
the
free end
s
through the loop and
around the coil of wire 2-3 times.
Use paperclips to create loops
for the armature axles to spin in
and tape them to the table.
Remove the top-half of each free
wire using scissors or
sandpaper.
Place magnets under the coil
and connect the posts to a 9 V
supply. Push to start.
Making a motor
Create a bobin using 50 mm
circles of cardboard with d = 33
mm holes spaced 1 cm apart.
Wrap each end to each end of
the LED. Solder if possible.
Wind approximately m of
magnet wire around a 35 mm
canister leaving a few cm free.
Secure the LED in place with
tape. Make sure the wires and
the LED legs do not touch.
Wrap the free ends around each
other to hold the coil together.
Secure with tape.
Place a neodymium magnet
inside the canister and secure
the lid in place.
Remove the insulation from each
end of wire using sandpaper or
scissors.
Shake the generator slowly at
fi rst and increase in speed.
Observe any differences.
Making a generator
