Lecture12_SP08

# Lecture12_SP08 - then your voltage drop is iR volts...

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Topics to be covered in class: Review: Kirchhoff’s rules Review: dissipated power Ammeter and Voltmeter RC circuit Independent reading: (a) Hazards of electric currents

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Analysis of Complex DC Circuits 1. Draw the circuit 2. Label all currents (one for each branch) 3. Designate a direction of current flow around all of the loops in your circuit (your choice is arbitrary) 4. Apply the Kirchhoff Junction Rule to reduce the number of unknown currents: The total current flowing into any branch point equals the total current flowing out of that branch point. 5. Apply the Kirchhoff Loop Rule to generate one equation for each loop you select: The sum of all voltage gains and drops around any closed loop in a circuit equals zero.
How to count voltage drops: accounting rules Positive voltage drops: (a) If you go through an EMF source from “+” to “-“ terminal, then your voltage drop is +E volts (b) If you go through resistor R in the direction of the current,

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Unformatted text preview: then your voltage drop is +iR volts Negative voltage drops: (a) If you go through an EMF source from “-” to “+“ terminal, then your voltage drop is (-E) volts (b) If you go through resistor R in the direction opposite to the current, then your voltage drop is (-iR) volts Voltage drop across a resistor is measured by a voltmeter Æ voltmeter is connected IN PARALLEL to the resistor Voltmeter should not draw any significant current from the resistor Æ voltmeter must have a HUGE RESISTANCE Current through resistor is measured by an ammeter Æ connect the ammeter IN SERIES with the resistor Ammeter should not modify the current flowing through the resistor Æ ammeter must have a TINY RESISTANCE Energy balance: calculate (a) energy of the capacitor U E and (b) work done by the battery W B Energy balance: calculate (a) energy of the capacitor U E and (b) work done by the battery W B...
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## This note was uploaded on 03/19/2008 for the course PHY 303L taught by Professor Turner during the Spring '08 term at University of Texas.

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Lecture12_SP08 - then your voltage drop is iR volts...

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