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  2. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    Unit fractions can also be expressed using negative exponents, as in 2 −1, which represents 1/2, and 2 −2, which represents 1/(2 2) or 1/4. A dyadic fraction is a common fraction in which the denominator is a power of two, e.g. ⁠ 1 / 8 ⁠ = ⁠ 1 / 2 3 ⁠. In Unicode, precomposed fraction characters are in the Number Forms block.

  3. Sources of electrical energy - Wikipedia

    en.wikipedia.org/wiki/Sources_of_electrical_energy

    The electric field sends the electron to the p-type material, and the hole to the n-type material. If an external current path is provided, electrical energy will be available to do work. The electron flow provides the current, and the cell's electric field creates the voltage. With both current and voltage the silicon cell has power.

  4. Electrical resistivity and conductivity - Wikipedia

    en.wikipedia.org/wiki/Electrical_resistivity_and...

    A piece of resistive material with electrical contacts on both ends. In an ideal case, cross-section and physical composition of the examined material are uniform across the sample, and the electric field and current density are both parallel and constant everywhere.

  5. Electroshapable material - Wikipedia

    en.wikipedia.org/wiki/Electroshapable_material

    One of the limitations of these products using conventional thermoplastics is the equipment required for their implementation. Indeed, the heat energy required to raise the material to its melting point is generally provided by the use of an oven or a water bath. The electroshapable materials also make it possible to form product to the user ...

  6. Electrical reactance - Wikipedia

    en.wikipedia.org/wiki/Electrical_reactance

    In electrical circuits, reactance is the opposition presented to alternating current by inductance and capacitance. [1] Along with resistance, it is one of two elements of impedance; however, while both elements involve transfer of electrical energy, no dissipation of electrical energy as heat occurs in reactance; instead, the reactance stores energy until a quarter-cycle later when the energy ...

  7. Orders of magnitude (energy) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(energy)

    3.7×10 7 J $1 of electricity at a cost of $0.10/kWh (the US average retail cost in 2009) [121] [122] [123] 4×10 7 J Energy from the combustion of 1 cubic meter of natural gas [124] 4.2×10 7 J Caloric energy consumed by Olympian Michael Phelps on a daily basis during Olympic training [125] 6.3×10 7 J

  8. $2,000 Quarter? Check Your Pockets Before You Use This ... - AOL

    www.aol.com/2-000-quarter-check-pockets...

    It all depends on which type of quarter you use. If it’s a Wisconsin state quarter issued in 2004, it could be worth at least $2,000 and maybe much more. The vast majority of 2004 Wisconsin ...

  9. Coulomb's law - Wikipedia

    en.wikipedia.org/wiki/Coulomb's_law

    In 1600, English scientist William Gilbert made a careful study of electricity and magnetism, distinguishing the lodestone effect from static electricity produced by rubbing amber. [8] He coined the Neo-Latin word electricus ("of amber" or "like amber", from ἤλεκτρον [ elektron ], the Greek word for "amber") to refer to the property of ...