Shown above is the same breadboard circuit from Q1-Q4 that is connected to the AD2's V+ and Ground leads as shown. The positive supply is enabled, but the supplied voltage value is not given to you.

You are given the following information (disregard the voltage & current information from Q1-Q4)

R1 = 150 Ω
R3 = 100 Ω
Vth = 2.5 V (i.e., Thevenin voltage is 2.5 V for the equivalent network between points A and B)
Rth = 325 Ω (i.e., Thevenin resistance is 325 Ω for the equivalent network between points A and B)

What then must the value of R2 be?

The units for your answer is Ohms (Ω). Enter the numerical value only below (do not type the units).

Question

Shown above is the same breadboard circuit from Q1-Q4 that is connected to the AD2's V+ and Ground leads as shown.  The positive supply is enabled, but the supplied voltage value is not given to you.

You are given the following information  (disregard the voltage & current information from Q1-Q4)

R1 = 150 Ω
R3 = 100 Ω
Vth = 2.5 V   (i.e., Thevenin voltage is 2.5 V for the equivalent network between points A and B)
Rth = 325 Ω   (i.e., Thevenin resistance is 325 Ω for the equivalent network between points A and B)

What then must the value of R2 be?

The units for your answer is Ohms (Ω).  Enter the numerical value only below  (do not type the units).

BlackTom AI · Accepted Answer

The question provided includes a schematic description and Thevenin parameters (Vth = 2.5 V, Rth = 325 Ω) for the equivalent network between points A and B, and asks for the value of R2 in ohms. However, the actual answer choices (the numerical options to pick from) are not present in the provided data. Without the set of possible options, I cannot indicate which one is correct or explain why a specific option is correct among a list.

What I can do is outline the reasoning you would use once the options are known and how to compute R2 from the Thevenin equivalent:

- Step 1: Understand the Thevenin model between A and B. You have a Thevenin voltage source Vth = 2.5 V in series with Rth = 325 Ω connected across AB when nothing else is connected.
- Step 2: Determine what external circuit is connected at AB in the actual problem (through R2, R1, R3, and any other components). The value of R2 must be chosen so that the voltage or current at AB satisfies the given condition (often a target voltage at AB or a target current through AB given the rest of the network).
- Step 3: Replace the network to the left of AB with the Thevenin equivalent (2.5 V in series with 325 Ω). Then, include R2 in the path that connects AB to the rest of the circuit as shown in the schematic. The rest of R1 and R3 values will determine the load seen at AB, along with how R2 is placed in the circuit.
- Step 4: Write the appropriate circuit equation for the AB node, typically using voltage division or Ohm's law for series/parallel combinations. If the target is a specific voltage at AB (e.g., the AD2 input expecting a certain voltage), solve for R2 accordingly from V_AB = Vth × (R_load / (R_th + R_load)), where R_load is the equivalent resistance seen by the Thevenin source across AB when R2 is considered in the network.
- Step 5: If the target is a current through AB or a voltage drop across R2, set up the equation for I or V accordingly, incorporating R1 and R3 as part of the load network as they connect in the physical layout. Solve for R2 algebraically.

Miscellaneous notes:
- Ensure all resistances are in ohms and voltages in volts; keep track of series versus parallel configurations when combining R1, R2, and R3 as indicated by the actual wiring in the schematic.
- If multiple valid R2 values could satisfy a condition due to symmetric or redundant paths, check the problem’s wording for any additional constraints (e.g., minimum/maximum R2, or integer ohm value choices).

If you can provide the missing answer options (the list of possible R2 values), I can walk through each option, showing why the correct one satisfies the circuit equations and why the others do not, with detailed, varied explanations.

ELEN20005_2025_SM2 Quiz #2

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