L15_Circuits08

# L15_Circuits08 - Ranking Task Activity One more capacitor...

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One more capacitor network 1µF 2µF 3µF 4µF 6µF 5µF 30V What is the charge stored on each? What is the total energy stored? Remember: Q on a capacitor =C of that capacitor V across that capacitor
Which of these diagrams represent the same circuit? 1. a and b 2. a and c 3. b and c 4. a, b, and c 5. a, b, and d

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Resistivity and Resistance Resistivity indicates how easily a current flows through a certain material due to what the material is Resistance indicates how easily a current flows through a particular object due to resistivity and shape .
To summarize: Resistance is a measure of the difficulty charges have moving through an object. It depends on what the material is, how long it is, and how much area there is to travel through. When you apply a voltage across an object (and create an electric field) charges will start to move (= a current). Their movement will be limited by how difficult it is for them to move (=resistance).

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Ohm’s Law The current density ( J =Current/Cross Sectional Area) for many materials, including metals, is proportional to the electric field ( E ). The constant of proportionality is the conductivity ( σ ) which is the reciprocal of the resistivity ( ρ ) ρ J = s r E Again, though, these are not the easiest items to measure, we tend to measure voltage instead of electric field, current instead of current density, and resistance instead of resistivity.
V = I R Voltage (potential difference, voltage drop) between 2 points

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## This note was uploaded on 04/08/2008 for the course PHY 113 taught by Professor Kamela during the Fall '08 term at Elon.

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L15_Circuits08 - Ranking Task Activity One more capacitor...

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