PHYS 102 Study Guide - Midterm Guide: Relative Permittivity, Electric Potential Energy, Dielectric
10 Sep 2016
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Wires serve as conduits for charge. These elements are idealizations of components in electronic circuits and in nature: neurons, circulatory system. Light bulb 1 and 2 are connected end-to-end by conducting wire. Current does not get used up by light bulb. Battery: maintains a constant electric potential difference (electromotive force = emf, potential difference across a circuit element is. Pushes charges, like a pump: flow rate depends on electric potential difference. Moving charges collide with each other, ion, and defects inside material. = resistivity density of scatters. L = length the longer the resistor, the more scattering. A = cross-sectional area (pi r^2) the wider the resistor, the more charges flow. Power: rate of energy conversion, battery does work by pumping charges thru circuit. Power of battery = rate at which it converts chemical energy to electrical energy. Charges lose electric potential energy in electric potential energy collisions inside resistor. P = iv = i^2 r = v^2 / r.
