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# lect05_handout - Physics 102 Lecture 05 Circuits and Ohm's...

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Physics 102: Lecture 5, Slide 1 Circuits and Ohm’s Law Physics 102: Lecture 05

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Physics 102: Lecture 5, Slide 2 Summary of Last Time • Capacitors – Physical C = ε 0 A/d C=Q/V – Series 1/C eq = 1/C 1 + 1/C 2 – Parallel C eq = C 1 + C 2 – Energy U = 1/2 QV • Resistors – Physical R = ρ L/A V=IR – Series R eq = R 1 + R 2 – Parallel 1/R eq = 1/R 1 + 1/R 2 – Power P = IV Summary of Today
Physics 102: Lecture 5, Slide 3 Electric Terminology • Current: Moving Charges – Symbol: I – Unit: Amp Coulomb/second – Count number of charges which pass point/sec – Direction of current is direction that + flows Power: Energy/Time – Symbol: P – Unit: Watt Joule/second = Volt Coulomb/sec – P = VI

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Physics 102: Lecture 5, Slide 4 Physical Resistor Resistance: Traveling through a resistor, electrons bump into things which slows them down. R = ρ L /A ρ : Resistivity: Density of bumps L : Length of resistor A : Cross sectional area of resistor Ohms Law I = V/R Cause and effect (sort of like a=F/m) potential difference cause current to flow resistance regulate the amount of flow Double potential difference double current I = (VA)/ ( ρ L) A L