# ch18notes - Chapter 18 Notes Basic DC Circuit V C R voltage...

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Chapter 18 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Basic DC Circuit: V – C – R” + voltage LOAD source Voltage Sources: 1) Batteries: chemical electrical 2) Solar cells: light electrical 3) Generators: magnetism electrical 4) Thermocouples: heat electrical 5) Piezoelectric crystal: pressure electrical Emf E – “electromotive force” theoretical, ideal voltage difference voltage difference when source is not in use Electric Current I net flow of charge conventional vs. electron flow ac vs. dc t q I SI unit: ampere (A) = coulomb/sec Resistance R measure of how well a device conducts electricity, e.g. high R low I depends on: 1) material 3) length 2) temperature 4) width (thickness) For a wire, A L R SI unit: ohm (Ω) ρ is the resistivity in Ω -m, Table 18.1, p.646 Resistors have a fixed resistance may be purchased commercially regulate voltage and current, essential to every circuit

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