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Unformatted text preview: Homework 2 Answers Back Question 1 (1 point) Question 21a What is the formula for the impedance of a capacitor in complex form? Student response: Percent Value Correct Response Student Response Answer Choices 100.0% a. Z C = 1/j C 0.0% b. Z C = j C 0.0% c. Z C = C + j 0.0% d. Z C = C  j General feedback: The impedance of capacitors and inductors can be expressed very simply in complex nota the class notes for details or read about Capacitive and Inductive Impedance in this sectio http://www.phys.ualberta.ca/~gingrich/phys395/notes/node29.html#SECTION003300000 Score: 1 / 1 Question 2 (1 point) Question 21b What is the formula for the impedance of an inductor in complex form? Student response: Percent Value Correct Response Student Response Answer Choices 100.0% a. Z L = j L 0.0% b. Z L = 1/j L 0.0% c. Z L = L + j 0.0% d. Z L = L  j General feedback: The impedance of capacitors and inductors can be expressed very simply in complex nota the class notes for detailsor read about Capacitive and Inductive Impedance in this section http://www.phys.ualberta.ca/~gingrich/phys395/notes/node29.html#SECTION003300000 Score: 1 / 1 Question 3 (1 point) Question 22a In the circuit below, calculate the maximum current in R1, at very high frequencies, if R1=3K ohms, R2=4K microfarads and VSIN has an amplitude of 13volts. Express your answer in milliamps. Hint: Remember the b capacitors at high frequencies. Student response: 4.333 Correct answer: 4.33333 General feedback: If a resistor is in parallel with a short, all the current flows through the short, no current fl the resistor, and it may as well not be in the circuit at all. If a resistor is in parallel with an all the current will flow through the resistor, and the open circuit may as well not be there Score: 1 / 1 Question 4 (1 point) Question 22b In the circuit below, calculate the maximum current in R1, at very low frequencies, if R1=5K ohms, R2=3K microfarads and VSIN has an amplitude of 14volts. Express your answer in milliamps. Hint: Remember the b capacitors at low frequencies. Student response: 1.75 Correct answer: 1.75000 General feedback: If a resistor is in parallel with a short, all the current flows through the short, no current fl the resistor, and it may as well not be in the circuit at all. If a resistor is in parallel with an all the current will flow through the resistor, and the open circuit may as well not be there Score: 1 / 1 Question 5 (1 point) Question 23a In the circuit below, calculate the amplitude of the voltage across R1 if R1=2K ohms, R2=3K ohms, R3=692 the amplitude of VSIN is 15volts. Express your answer in volts. Student response: 5.27 Correct answer: 5.27056 General feedback: Although this is an AC question, you can use the DC rules for combining circuits to find t amplitude given the input amplitude. Note that amplitudes can never be negative. Also no voltage divider rule can only be applied to a series circuit, so any parallel components mu...
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This note was uploaded on 04/07/2008 for the course ENGR 4300 taught by Professor Kraft during the Spring '08 term at Rensselaer Polytechnic Institute.
 Spring '08
 KRAFT
 Impedance

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