Download Invisible Forces - SWE-MN

Simple Motor Experiment
1
Electricity
• Much like water, electricity
– Flows between points (From + to – on a
battery)
– Can be shut off
– Can be stored
– Can be used
• The steady flow of electricity is called
current (water also has current)
2
Electricity
• Electricity has the equivalent to water
pressure
– Think of the pressure as voltage (potential to
push electrons between two points)
– Actual current movement is measured by
amperage
– Like a big pipe can move lots of water, thick
wires can carry a lot of voltage
3
4
Magnets
• How many students have played with
magnets?
• How many students know what an
electromagnet is?
• Aren’t magnets fun!?!?
5
Electromagnetic Concepts
• Coulomb’s Law (1785) – Two kinds of
charge, positive and negative. Like
charges repel and unlike charges attract.
6
Electromagnetic Concepts
• Carl Fredrich Gauss – One magnetic pole
cannot exist without another, equal and
opposite pole.
7
Electromagnetic Concepts
• Andre Marie Ampere
– Ampere’s Law – If current flows through a
wire, it will generate a magnetic field. The
strength of the magnetic field is directly
related to the amount of current that flows.
8
Check Your Supplies
• Materials
– Sanding block
– Coated Copper Wire
– 1 Battery
– One large magnet
– 2 Paperclips
– 1 Rubber Binder
– 1 Cardboard Square
9
Step 1: Create the Coil
•
•
•
•
Wrap the copper wire around the pipe or battery five times,
leaving one to two inches of wire on both ends of the coil.
Wrap the loose ends around the coil so they are parallel
with each other
Sand one loose end of the wire completely
Sand half of the other loose end.
10
Step 2: Bend the Paperclips
• Bend the paperclips to
this shape
• Secure the paperclips
to both ends of the
battery with the rubber
binder
11
Final Product
12
13
References
• Beakman’s Motor
– http://fly.hiwaay.net/~palmer/motor.html
14