This section contains pictures and descriptions of
the MHD motor, static display and boat which I used in my presentation.
- Firstly, you need to see how many batteries you
need to carry on the boat. By experimentation and calculation
it was found that the force produced
current of 3A, supplied by a 9 volt battery, would do nicely.
Is 9 volts enough to produce this current in a saturated
salt water solution?
A is the cross sectional area of the material in
which the current is traveling
is the conductivity of the material
In this case the material is a saturated salt water
The Static Display
The Boat was made out
of a large piece of plastic Styrofoam and looked a bit like a
The motor was attached to the bottom by the copper
rods (see above). The batteries and switching mechanism (to switch
the polarity of the electrodes) were contained in a waterproof
Tupperware container mounted on top of the barge.
(Sorry, no picture due to technical difficulties.
You're just going to have to imagine it.)
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