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  2. Electric current - Wikipedia

    en.wikipedia.org/wiki/Electric_current

    In other media, any stream of charged objects (ions, for example) may constitute an electric current. To provide a definition of current independent of the type of charge carriers, conventional current is defined as moving in the same direction as the positive charge flow. So, in metals where the charge carriers (electrons) are negative ...

  3. Paper towel - Wikipedia

    en.wikipedia.org/wiki/Paper_towel

    The growth in commercial use of paper towels can be attributed to the migration from folded towels (in public bathrooms, for example) to roll towel dispensers, which reduces the amount of paper towels used by each patron. [12] Within the forest products industry, paper towels are a major part of the "tissue market", second only to toilet paper ...

  4. Triboelectric effect - Wikipedia

    en.wikipedia.org/wiki/Triboelectric_effect

    An example is rubbing a plastic pen on a shirt sleeve made of cotton, wool, polyester, or the blended fabrics used in modern clothing. [39] An electrified pen will attract and pick up pieces of paper less than a square centimeter, and will repel a similarly electrified pen.

  5. Electricity - Wikipedia

    en.wikipedia.org/wiki/Electricity

    The electric field was formally defined as the force exerted per unit charge, but the concept of potential allows for a more useful and equivalent definition: the electric field is the local gradient of the electric potential. Usually expressed in volts per metre, the vector direction of the field is the line of greatest slope of potential, and ...

  6. Absorbance - Wikipedia

    en.wikipedia.org/wiki/Absorbance

    Absorbance is defined as "the logarithm of the ratio of incident to transmitted radiant power through a sample (excluding the effects on cell walls)". [1] Alternatively, for samples which scatter light, absorbance may be defined as "the negative logarithm of one minus absorptance, as measured on a uniform sample". [2]

  7. Alternating current - Wikipedia

    en.wikipedia.org/wiki/Alternating_current

    The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa (the full period is called a cycle). "Alternating current" most commonly refers to power distribution, but a wide range of other applications are technically ...

  8. Global atmospheric electrical circuit - Wikipedia

    en.wikipedia.org/wiki/Global_atmospheric...

    The global circuit concept is closely related to atmospheric electricity, but not all atmospheres necessarily have a global electric circuit. [2] The basic concept of a global circuit is that through the balance of thunderstorms and fair weather, the atmosphere is subject to a continual and substantial electrical current.

  9. Electrorheological fluid - Wikipedia

    en.wikipedia.org/wiki/Electrorheological_fluid

    With no applied electric field the third phase is strongly attracted to and held within the particles. This means the ER fluid is a suspension of particles, which behaves as a liquid. When an electric field is applied the third phase is driven to one side of the particles by electro osmosis and binds adjacent particles together to form chains ...

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