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Physics 106 Homework5

# Physics 106 Homework5 - Physics 106 Homework#5 Submitting...

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Physics 106 Homework #5 Submitting Answers Remember to be careful about units. Implicit multiplication is not understood. Type 3*x, not 3x Defined Constants The following constants can be used by name throughout this assignment: . Problem 5.1 Purpose: This is another circuit example. In the next problem, we'll have a simple application of Kirchoff's rules. Problem with data for try #1 : The figure shows a circuit diagram. Determine the current. R1 = 1000 Ω. Additional input values R1 (Ω): 1070, 1020 Defined symbols: R1 resitance in Ω The answer is I , current in mA Hints: Note that it doesn't matter where batteries and resistors are located along a wire between junctions. (Here there are really no junctions as the connection to ground carries no current. All the ground does is set the voltage at that point to zero.) That means that the batteries can combine as one battery and the resistors as one resistor to calculate the total current. Range of answers: 2.75 mA to 3.27 mA . Problem 5.2 Purpose: This is a continuation of Problem 5.1. Here Kirchoff's rules are helpful. Problem with data for try #1 : The figure shows a circuit diagram. Determine the potential of wire A relative to ground. R1 = 1000 Ω. Additional input values R1 (Ω): 1070, 1020

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Defined symbols: R1 resitance in Ω The answer is Va , potential of wire A in V Hints: Kirchhoff's rules come into play when you wish to find the voltage on the wire at A. It may help to put + and – on the resistors and batteries to keep track of whether voltage is going up or down. Range of answers: –19.5 V to – 18.5 V . Problem 5.3 Purpose: This is one more question from the same circuit. Problem with data for try #1 : The figure shows a circuit diagram. Determine the voltage drop across the 1500 Ω resistor. R1 = 1000 Ω. Additional input values R1 (Ω): 1070, 1020 Defined symbols: R1 resitance in Ω The answer is Vc , voltage drop in V
Hints: Kirchhoff's rules come into play when you wish to find the voltage on the wire at A. It may help to put + and – on the resistors and batteries to keep track of whether voltage is going up or down. Range of answers: 4.10 V to 4.90 V . Problem 5.4 Purpose: None Problem with data for try #1 : In the circuit in the figure, the current I 1 is 3.15 A while the values of ε and R are unknown. What is the current I 2 ? Additional input values I1 (A): 3.45, 3.32 Defined symbols: I1 current in A The answer is I2 , the current in A Hints: Note that none of the resistors are in series or in parallel, so we must use Kirchhoff's rules to solve this problem, although the circuit is quit simple. Go over the example from class and follow the steps carefully. If you learn this method, you'll be able to set up the equations for very complicated problems by following the same steps. Range of answers: –3.50 A to –0.500 A

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Physics 106 Homework5 - Physics 106 Homework#5 Submitting...

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