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  2. Faraday's law of induction - Wikipedia

    en.wikipedia.org/wiki/Faraday's_law_of_induction

    Heaviside's version (see Maxwell–Faraday equation below) is the form recognized today in the group of equations known as Maxwell's equations. Lenz's law , formulated by Emil Lenz in 1834, [ 13 ] describes "flux through the circuit", and gives the direction of the induced emf and current resulting from electromagnetic induction (elaborated ...

  3. Mathematical descriptions of the electromagnetic field

    en.wikipedia.org/wiki/Mathematical_descriptions...

    The source free equations can be written by the action of the exterior derivative on this 2-form. But for the equations with source terms (Gauss's law and the Ampère-Maxwell equation), the Hodge dual of this 2-form is needed. The Hodge star operator takes a p-form to a (n − p)-form, where n is the number of dimensions.

  4. This Light-But-Powerful Greenworks 80V Cordless Leaf ... - AOL

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    In our testing, we liked how Greenworks saved weight while focusing the air stream via the tapered tube. This Light-But-Powerful Greenworks 80V Cordless Leaf Blower Is 28% Off at Amazon Skip to ...

  5. IUoU battery charging - Wikipedia

    en.wikipedia.org/wiki/IUoU_battery_charging

    As a result of this current, the battery absorbs a charge and its voltage rises. The charger limits the maximum voltage to U max, a constant or temperature-dependent maximum, typically around 2.4 V per cell. Once the U max voltage is reached, typically when the battery is charged to 70–80% of its capacity, [1] the charger enters the Uo-phase ...

  6. Electromotive force - Wikipedia

    en.wikipedia.org/wiki/Electromotive_force

    For a circuit using a battery source, the emf is due solely to the chemical forces in the battery. For a circuit using an electric generator, the emf is due solely to a time-varying magnetic forces within the generator. Both a 1 volt emf and a 1 volt potential difference correspond to 1 joule per coulomb of charge.

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  8. Electrochemical cell - Wikipedia

    en.wikipedia.org/wiki/Electrochemical_cell

    A wire connects two different metals (e.g. zinc and copper). Each metal is in a separate solution; often the aqueous sulphate or nitrate forms of the metal, however more generally metal salts and water which conduct current. [4] A salt bridge or porous membrane connects the two solutions, keeping electric neutrality and the avoidance of charge ...

  9. Deck the halls (extra carefully): Common Christmas injuries ...

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    In the past two decades, that added up to nearly 312,000 estimated trips to the emergency room, according to a CNN analysis of data from the US Consumer Product Safety Commission.