Physics II Kirchoff's Laws and Voltage
Physics II Kirchoff's Laws and Voltage PHYS 2020
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This 5 page Study Guide was uploaded by Lauren Adams on Sunday January 31, 2016. The Study Guide belongs to PHYS 2020 at Tennessee State University taught by Dr. Geoffrey Burks in Fall 2014. Since its upload, it has received 49 views. For similar materials see Physics 2 in Physics 2 at Tennessee State University.
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Date Created: 01/31/16
Chapter 26 Kirchhoff's Laws and all the extra Monday, November 17, 2014 7:13 PM EMF = Electromotive Force Not a force Ideal electric potential across a battery Terminal voltage Actual potential across the battery by looking at the terminals of the battery Resistors and Resistance Resistors can be in series and in parallel just like capacitors, voltmeters, ammeters, and basically all types of circuit elements. Resistors allow for voltage drops along them, making sure that current does not get too high. Without resistors…many of our electronics would not work. Please look at the previous notes for more on this. KIRCHOFF'S RULES These allow for a better understanding of electric currents and circuits in general. JUNCTION RULE As shown in this picture, since I2 and I3 are going out of the junction,1 = 2I 3 I or the equation listed at the end of the picture. Just remember that series resistors have the same current, series capacitors have the same charge, parallel resistors and parallel capacitors have the exact same voltage. Everywhere in a circuit does not have parallel, the current is the same. Current splits when the resistor goes parallel. There is a lower current with a high resistor. Resistance in a resistor is constant You cannot build charge on a resistor LOOP RULE Don't really pay attention to the sign conventions that the book or Dr. Burks uses. Just remember: o If you travel in the same direction as the current, then take it as positive. (VICE VERSA) o If you travel across an EMF through the negative terminal first, the take the value as negative. (VICE VERSA) For example: In the picture to the left, we shall take two different loop directions to show how this loop rule works. Using Kirchhoff's Rules allows many different circuit diagrams to be understood. RC Circuits!! Include resistors and capacitors! Mainly used to charge capacitors. How does a capacitor charge? When the capacitor is connected to a source of emf ( a battery), it instantaneously becomes super charged! Its voltage increases while the potential difference across the resistor decreases, creating an decrease in current in the capacitor. Once the capacitor is fully charged, there is a sudden decrease in current. I = 0. The potential across the resistor is 0 as well. We generally use lowercase variables i and q when dealing with time varying values. While the capacitor charges, the solution to the DE is: q = Q(1e t/R) where RC is the time constant tau. When the battery is taken out of the circuit, and the capacitor is allowed to discharge through the resistor; then the charge decreases, and the current decreases exponentially. The charge is then given by: q = Q e t/R and the current is 0 still given by: i = I 0 t/R . The voltage goes to a maximum.
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