Resistors and Capacitors.

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Resistors and Capacitors.

Today we discussed how to find equivalent resistance and capacitance for resistors and capacitors in series versus parallel.

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The University of Vermont
Phys 012 - Elementary Physics
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Lecture 9 Outline of Last Lecture I. Electric current: net flow of charge per unit time through some region a. By convention, current flows in the direction that positive charge would move. Electrons (the charge carriers for metals) will flow in the opposite direction of electric current. b. Measured in ampheres, amps (A) i. 1 A = 1 C/s II. Ohm’s Law: relationship between potential difference and current a. Drift speed (vd): net speed an electron moves i. Path of motion is not actually linear due to collisions with other particles, which causes a certain amount of resistance as electrons move through a material. b. ΔV = IR i. R = resistance = (ρL)/A for a conductive wire 1. ρ = resistivity (larger with more resistance, like in non-metals) 2. L = length of conductive wire 3. A = cross-sectional area of wire (πr2) c. Only applicable to ohmic materials d. R = ΔV/I in ohms (Ω) i. 1 Ω = 1 V/A e. ρ in Ω*m III. Electrical power: rate of energy consumed by resistor a. P = IΔV ( = I2R = V2/R ) i. V = IR ; I = V/R b. Electric circuits: Physics 012 1st Edition

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