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L3-Transport

# L3-Transport - Generalized Linear Transport Physics 7B...

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Generalized Linear Transport Physics 7B - Lecture 3 Prof. Conway

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Fluid Flow PRS Rank the pressures (assume no change in height): A. P 1 = P 2 = P 3 B. P 1 > P 2 > P 3 C. P 1 < P 2 < P 3
Simple Resistor Circuit

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Simple Circuit Rules 1. the current in a circuit branch is the same everywhere 2. the voltage at all points connected by a wire is the same 3. you can set V = 0 any where you want in the circuit 4. if you go through a battery, the voltage changes by E 5. if you go through a resistor, the voltage changes by IR current: I emf: E = IR power: P = I 2 R
Simple Circuit Rules If you have a resistor, and you know that there is a voltage drop across it of Δ V, then there must be a current in it of Also, if you know the current you can get Δ V !

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Complete Circuit a battery just gives you a change in voltage equal to its emf as you trace around a complete circuit, the voltage goes up through a battery and down through a resistor (in the direction of the current)
Voltage in a Series Circuit let’s analyze the voltage in a simple circuit: V=0 V 1 = 6V R eq

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Voltage in a Parallel Circuit now let’s analyze a parallel circuit: only two voltages to worry about! Or we can use parallel equivalent resistance formula:
now let’s analyze a parallel circuit: only two voltages to worry about! R

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L3-Transport - Generalized Linear Transport Physics 7B...

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