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Solar-powered calculators generate their power from a Light source. Many basic electronic calculators do not require a great deal of power to operate, so a small, built-in solar panel is often a sufficient energy source. On a solar-powered Calculator, energy is generated on a photovoltaic panel that absorbs light and converts it into energy that powers the calculator. These panels are made from silicone, with metal additives to better conduct electricity. The light hits the photovoltaic panel contains energy, and when it comes into contact with the cell, the silicone releases electrons. A process of electron exchange then takes place between atoms on the photovoltaic panel, creating a flow of electricity that is conducted by the metal ends of the panel. A solar-powered calculator then takes this electricity to power its use. This type of calculator uses a power-efficient liquid crystal display and only requires 1.5-2 volts of electricity to operate.