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Solar Technology related terms beginning with E.




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  • Edge-Defined Film-Fed Growth (EFG) : A method for making sheets of polycrystalline silicon for photovoltaic devices in which molten silicon is drawn upward by capillary action through a mold.

  • Electric Circuit : The path followed by electrons from a power source (generator or battery), through an electrical system, and returning to the source.

  • Electric Current : The flow of electrical energy (electricity) in a conductor, measured in amperes.

  • Electrical grid : An integrated system of electricity distribution, usually covering a large area.

  • Electricity : Energy resulting from the flow of charge particles, such as electrons or ions.

  • Electrochemical Cell : A device containing two conducting electrodes, one positive and the other negative, made of dissimilar materials (usually metals) that are immersed in a chemical solution (electrolyte) that transmits positive ions from the negative to the positive electrode and thus forms an electrical charge. One or more cells constitute a battery.

  • Electrode : A conductor that is brought in conducting contact with a ground.

  • Electrodeposition : Electrolytic process in which a metal is deposited at the cathode from a solution of its ions.

  • Electrolyte : A nonmetallic (liquid or solid) conductor that carries current by the movement of ions (instead of electrons) with the liberation of matter at the electrodes of an electrochemical cell.

  • Electron : An elementary particle of an atom with a negative electrical charge and a mass of 1/1837 of a proton; electrons surround the positively charged nucleus of an atom and determine the chemical properties of an atom. The movement of electrons in an electrical conductor constitutes an electric current.

  • Electron Volt (eV) : The amount of kinetic energy gained by an electron when accelerated through an electric potential difference of 1 Volt; equivalent to 1.603 x 10^-19; a unit of energy or work.

  • Energy : The capability of doing work; different forms of energy can be converted to other forms, but the total amount of energy remains the same.

  • Energy Audit : A survey that shows how much energy used in a home, which helps find ways to use less energy.

  • Energy Contribution Potential : Recombination occurring in the emitter region of a photovoltaic cell.

  • Energy Density : The ratio of available energy per pound; usually used to compare storage batteries.

  • Energy Levels : The energy represented by an electron in the band model of a substance.

  • Epitaxial Growth : The growth of one crystal on the surface of another crystal. The growth of the deposited crystal is oriented by the lattice structure of the original crystal.

  • Equalization : The process of restoring all cells in a battery to an equal state-of-charge. Some battery types may require a complete discharge as a part of the equalization process.

  • Equalization Charge : The process of mixing the electrolyte in batteries by periodically overcharging the batteries for a short time.

  • Equalizing Charge : A continuation of normal battery charging, at a voltage level slightly higher than the normal end-of-charge voltage, in order to provide cell equalization within a battery.

  • Equinox : The two times of the year when the sun crosses the equator and night and day are of equal length; usually occurs on March 21st (spring equinox) and September 23 (fall equinox).

  • Extrinsic Semiconductor : The product of doping a pure semiconductor.




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