Problem 4: The circuit below is a common configuration that can be used to determine the value of a resistor, Rx. This is usually achieved by prescribing values for the R1 and R2 resistors, and then using an adjustable resistor (i.e., a "potentiometer") for R3. When the resistors are properly balanced, one could connect a resistor across the bridge at the points indicated by arrows and no current would flow across the resistor. Complete parts A - I. R₁ Vb M R3 R₂ m Rx Part A: Using the passive sign convention, make reference marks on the circuit (current directions and polarity symbols). Where needed, assign circuit variables to the elements. Indicate nodes (A,B,C, ...) and a ground that you would use for nodal analysis. Indicate meshes that you would use for mesh analysis. Part B: Suppose you want to determine the voltages across R3 and Rx very quickly. Briefly explain how this can be done by inspection (i.e., without formal analyses like nodal or mesh) by exploiting the circuit structure and indicate which features allow you to do this. (i.e., the solution by inspection, not a system of equations)

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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help with part a and b...not allowed to redraw circuit. thanks!

Problem 4: The circuit below is a common configuration that can be used to determine the value of a
resistor, Rx. This is usually achieved by prescribing values for the R1 and R2 resistors, and then using
an adjustable resistor (i.e., a “potentiometer") for R3. When the resistors are properly balanced, one
could connect a resistor across the bridge at the points indicated by arrows and no current would flow
across the resistor. Complete parts A - I.
R₁
V₂
R₂
M
m
Rx
R3
Part A: Using the passive sign convention, make reference marks on the circuit (current directions and
polarity symbols). Where needed, assign circuit variables to the elements. Indicate nodes (A,B,C, ...)
and a ground that you would use for nodal analysis. Indicate meshes that you would use for mesh
analysis.
Part B: Suppose you want to determine the voltages across R3 and Rx very quickly. Briefly explain how
this can be done by inspection (i.e., without formal analyses like nodal or mesh) by exploiting the
circuit structure and indicate which features allow you to do this. (i.e., the solution by inspection, not a
system of equations)
Transcribed Image Text:Problem 4: The circuit below is a common configuration that can be used to determine the value of a resistor, Rx. This is usually achieved by prescribing values for the R1 and R2 resistors, and then using an adjustable resistor (i.e., a “potentiometer") for R3. When the resistors are properly balanced, one could connect a resistor across the bridge at the points indicated by arrows and no current would flow across the resistor. Complete parts A - I. R₁ V₂ R₂ M m Rx R3 Part A: Using the passive sign convention, make reference marks on the circuit (current directions and polarity symbols). Where needed, assign circuit variables to the elements. Indicate nodes (A,B,C, ...) and a ground that you would use for nodal analysis. Indicate meshes that you would use for mesh analysis. Part B: Suppose you want to determine the voltages across R3 and Rx very quickly. Briefly explain how this can be done by inspection (i.e., without formal analyses like nodal or mesh) by exploiting the circuit structure and indicate which features allow you to do this. (i.e., the solution by inspection, not a system of equations)
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