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Photons from sunlight carry enough energy to jar electrons from their orbit in the element silicon, which is the material used in most solar cells. When photons strike the material and break electrons free from their orbits, this electrical field pushes them toward the front of the solar cell, which creates a negatively charged side. When these two sides are connected using an external load -- an indirect circuit like the terminals of this solar battery charger -- the electrons flow into the load and creates electricity. This imbalance creates an electrical field
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