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Homework 1 Answers Back You are encouraged to run PSpice and look at web sites during this homework quiz. The questions review some things you should have learned in experiment 1 and help prepare you for experiment 2. TO GET BACK FROM A LINK TO A WEBPAGE, RIGHT CLICK AND CHOOSE BACK. Question 1 (1 point) Question 1-1 Which equation will give you the combined resistance in the circuit below? Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. RT = ((R1+R2)*(R3+R4))/((R1+R2)+ (R3+R4)) 0.0% b . RT = R1 + R4 + (R2*R3/(R2+R3)) 0.0% c. RT = R1 + (R3*(R2+R4))/(R3+(R2+R4)) 0.0% d . (1/RT) = R1+ R3 + (1/R2) + (1/R4) 100.0% e. RT = R1 + R3 + (R2*R4/(R2+R4)) 0.0% f. RT = R1 + R3 + (R2+R4/(R2*R4)) 0.0% g . RT = R1 + R2 + R3 + R4 0.0% h (1/RT) = (1/R1) + (1/R2) + (1/R3) +

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. (1/R4) General feedback: Use the laws for combining resistances to reduce the resistors to a single resistor with a value equal to the combined resistance. Score: 1 / 1 Question 2 (1 point) Question 1-2 What is the current in the circuit if V1=9V, R1=59 ohms, R2=4K ohms, R3=1K ohms and R4=9MEG ohms? Express your answer in milliamps. . (Answer tolerance is 2% and decimal places is 3) Student response: 1.78 Correct answer: 1.780 General feedback: You can find the current in the circuit by calculating the combined resistance and using ohms law (I=V/R). Score: 1 / 1 Question 3 (1 point) Question 1-3 In the circuit below, what is the voltage across resistor R1 if V1=10V, R1=41 ohms, R2=3K ohms, R3=2K ohms and R4=9MEG ohms? Express your answer in volts. (Answer tolerance is 2% and decimal places is 3).
Student response: 0.081 Correct answer: 0.081 General feedback: You can use ohms law to find the voltage across a resistor, once you know the current through the resistor. (Answer tolerance is 2% and decimal places is 3) Score: 1 / 1 Question 4 (1 point) Question 1-4 In the circuit below, what is the voltage across resistor R2 if V1=7V, R1=51 ohms, R2=1K ohms, R3=4K ohms and R4=10MEG ohms? Express your answer in volts. (Answer tolerance is 2% and decimal places is 3). Student response: 1.386 Correct answer: 1.386 General feedback: You can use ohms law to find the voltage across a resistor, once you know the current through the resistor. (Answer tolerance is 2% and decimal places

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is 3). Note that since R4 is so much bigger than R2, almost all the current goes through R2. If R2 and R4 are closer in value, this is not true. Score: 1 / 1 Question 5 (1 point) Question 1-5 In the circuit below, what is the current through R4 if V1=10V, R1=60 ohms, R2=1K ohms, R3=2K ohms and R4=11MEG ohms? Express your answer in microamps. (Answer tolerance is 2% and decimal places is 3). Student response: 0.297 Correct answer: 0.297 General feedback: Since R3 and R4 are in parallel, the current will divide between them. The voltage across each resistor, however, will be the same. Find the voltage first, using the total current and parallel resistance, then apply Ohm's law to calculate the portion of current through R4. Score:
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