The blender on top is controlled by a module that has a transmitter in it. The visitor does not know what that module will do until it is activated.
This is how circuits are made - there is a 12V potential difference between the two contacts.
The yellow module is a small incandescent bulb. The green module in the corner is a small gear motor.
Custom built switch with strong detents. This switch (the big knob on the front) selected the voltage of the unit: 3V, 6V, or 12V.
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Electricity!
This display allowed visitors to create simple electrical circuits by inserting modules between two permanent contacts. They could explore the relationship between voltage, current, and the effect polarity had on some devices but not others.
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