Electric Currents, Ohm's Law, and
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Electric Currents, Ohm's Law, and
Today we discussed how Ohm's Law relates electric currents, electric potential difference, and resistance. We also went over how to draw electric circuits and how they relate to resistance, electric currents, electrical power, and electric potential. (Cutnell 20.120.6)
 Lecture number:
 8
 Pages:
 4
 Type:
 Lecture Note
 School:
 The University of Vermont
 Course:
 Phys 012  Elementary Physics
 Edition:
 1
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Unformatted text preview:
Lecture 8 Outline of Last Lecture I. Review: a. Two positive charges i. V will always be positive (sum of two positive numbers) ii. E will equal zero at point half way between the two points (the two cancel out) b. A positive and a negative charge i. V will equal zero at point half way between the two points (the two cancel out) ii. E will never be zero II. Capacitors: two conductors near each other (not touching) carrying equal magnitude charge and opposite signs a. Capacitance (C): how much charge conductors can hold for a given potential difference i. C = Q/ΔV in farads (F) = 1 C/V ii. Depends on geometry of capacitor b. Parallel plate capacitor: consists of two parallel plates of opposite but equal (in magnitude) charge that, if they are close enough together, can be viewed mathematically as being infinite i. When connected to a battery (neg. plate to neg. side of battery and pos. plate to pos. side of battery), the voltage of the battery will equal the potential difference between the plates (0V at pos. plate and max potential at neg. plate) ii. C = (Aε0)/d when plates have an area of A and a distance of d between them iii. E = σ/ε0 with σ being the charge density (Q/A) of the plates c. Cylindrical capacitor Physics 012 1st Edition
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