PHYS 1062 Lecture Notes - Lecture 4: Electric Potential Energy, Electrical Network, Electromotive Force

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23 Mar 2016
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*** review: electric potential due to point charges. Electric potential energy for point charges: electric potential difference in a uniform electric field (e). - > v = vhigh vlow = ed, where d is the distance between two positions. - > work done on a charge particle by the electric field in a uniform e: equipotential lines (surface) (section 24-4) - > electric field is perpendicular to equipotential lines. 25 (skip sections 25-3, 25-6, 25-7, 25-8): capacitor and capacitance. - > energy stored in a capacitor (section 25-5: capacitors connected in parallel and in series. *** first simplify the circuit to find the equivalent capacitance, and then do other calculations backward. Potential drop (voltage) across each capacitor is the same. *** ceq = c1 + c2 + c3 + . *** q1 = q2 = q3 = charge on each capacitor is the same. *** 1/ceq = 1/c1 + 1/c2 + 1/c3 + .

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