You can make a solar cell to generate electricity from the sun using
a sheet of copper. Note that this does not produce a useful amount of
electricity, unlike silicon and other commercial solar cells, but is fun
to make. You would need acres of these copper solar cells to power your
home.
The simplest circuit to make is what is used in the above video and
illustrated in the following diagram. Make sure that the wires that
connect the two plates are above the level of the water. The electrical
circuit is completed through the water itself. Make sure you have
an ammeter that can display in the 0 to 50 microamp range since the
amount of current this type of cell produces is very small.
Circuit for solar cell in salty water.
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