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Tag Archives: Electric Current

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Capacitance & Resistance

ScienceBy William Anderson (Schoolworkhelper Editorial Team)April 23, 2011Leave a comment

Capacitor: two conducting plates charged with equal amount of charge of opposite signs, with insulator in between (we assume a vacuum unless said otherwise) Three quantities characterize a capacitor: 1) surface charge density 2) capacitance 3) dielectric constant Capacitance (q= C x ∆V) Unit: Farad (F) The potential difference across a parallel plate capacitor is…

Magnetism & Electromagnetism

ScienceBy William Anderson (Schoolworkhelper Editorial Team)July 30, 2010Leave a comment

Electric Current (the movement of electrons) in a wire can produce a force at a distance (a field) on metals made of any combination of Iron, Nickel, and Cobalt.  This is an electromagnet. All neutral atoms have electrons moving in orbits.  Some atoms (Iron, Nickel, and Cobalt) have an electron arrangement that act like tiny…

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