Solar Cell

The solar cell (B7) contains positively and negatively charged silicon crystals, arranged in layers that cancel each other out. When sunlight shines on it, charged particles in the light unbalance the silicon layers and produce an electrical voltage of up to 7V. The maximum current depends on the type of light and its brightness, but will be much less than a battery can produce. Bright sunlight works best, but incandescent light bulbs also work.