What is the
Electronics instructor Ollie Circuits planned to show his class of freshman electrical
engineering students how to use a super capacitor as a memory back-up capacitor,
but first he wanted to show how the students could make their own super capacitor
and demonstrate its charge/discharge cycles with the simple circuit above. Most of
the components were already on his workbench, the homemade super capacitor
would be made from several layers of lemon juice-soaked paper towels interleaved
between several layers of a mystery material to form a multi-layer stack. The stacked
layers would then be sandwiched between the two copper-clad PC boards and held
together with a rubber band. Ollie rushed to a nearby pet shop. What did he buy?
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