how to build an electric bell (instructables)

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Electric bell is another well known
product that uses an electromagnet.
This electric bell kit comes with a
booklet that tells you all about bell
science as well as assembly
instructions. You just need to buy a
battery.
Making an electric bell is an
educational and exciting experiment.
Start by learning about and making
an electromagnet. Use a compass
needle and a battery to test the
electromagnet. Then use the
electromagnet to build a buzzer and
finally mount a switch.
While assembling and experimenting
with this kit, think of building another
bell or buzzer with material that you
can find at home or purchase from a
local hardware store.
Electric Bell kit includes:
Plastic base
Bobbin
Magnet wire
Bell
Bell hammer
Compass needle
Screw and screw driver
spring
Metal contacts
sandpaper
Additional Materials Required:
Additional Materials Required for your
experiments can be found at home or
purchased locally. Some of these
material are:
Only a D cell battery.
Opportunities for Science Fair Projects
Building a buzzer is a good
experimental project. You can
experiment on different bells to create
different sounds. you can also
experiment with different size
batteries to compare the battery life.
You may also experiment and
compare the buzzer performance
based on the number of magnet wire
loops around the bobbin.