Principle

A single solar
cell supplies only 0.5 V. This is not sufficient for operating
light-emitting diodes or a small light bulb. In order to generate
more voltage, several solar cells are connected in series. The aim
of this experiment is to demonstrate the characteristics of series
or parallel connections of solar cells by measuring the
open-circuit voltage and short-circuit current and by comparing
these values to the values of a single solar cell.