Calculate the total equivalent resistance for the circuit. Assume R3=10 Ω and R4=1.5 Ω.

Question

Calculate the total equivalent resistance for the circuit. Assume R3=10 Ω and R4=1.5 Ω.

BlackTom AI · Accepted Answer

First, I identify the network topology from the diagram and the given values R3 = 10 Ω and R4 = 1.5 Ω. The left side consists of R1 = 30 Ω in series with a node that splits into two branches: one branch through R2 = 60 Ω to the bottom rail B, and another branch that goes upward through R3 to a top node, then through R4 to a node P that connects to three resistors R5, R6, and R7 in parallel down to the bottom rail B.

Step 1: Compute the equivalent resistance of the parallel trio R5, R6, R7, each 12 Ω, between node P and B.
- R5 || R6 || R7 = 1 / (1/12 + 1/12 + 1/12) = 1 / (3/12) = 1 / 0.25 = 4 Ω.

Step 2: Add R4 in series with that parallel group to obtain the equivalent resistance from node T (top of R4) to B.
- R4 + (R5 || R6 || R7) = 1.5 Ω + 4 Ω = 5.5 Ω.

Step 3: Add R3 in series with the previous result to get the equivalent resistance from node N (the node after R1) to B.
- R3 + [R4 + (R5 || R6 || R7)] = 10 Ω + 5.5 Ω = 15.5 Ω.

Step 4: Now consider the two branches from node N to B: one path is R2 = 60 Ω directly to B, and the other path is the series chain R3 → R4 → (R5 || R6 || R7) totaling 15.5 Ω from N to B. The two branches are in parallel between N and B.
- Req(NB) = 1 / (1/60 + 1/15.5) ≈ 1 / (0.0166667 + 0.0645161) ≈ 1 / 0.0811828 ≈ 12.324 Ω.

Step 5: Finally, the total equivalent resistance between A and B includes R1 (30 Ω) in series with the parallel combo of the two branches from N to B.
- Req(A B) = R1 + Req(NB) = 30 Ω + 12.324 Ω ≈ 42.324 Ω.

Summary: The calculated total equivalent resistance for the circuit, given R3 = 10 Ω and R4 = 1.5 Ω, is approximately 42.3 Ω. If your expected value differs (e.g., 35.1 Ω), please double-check the wiring or the assumed connections of R3, R4, and the R5–R7 network, since small changes in topology (which components connect where) can significantly alter the result. In particular, re-evaluating whether R3 and R4 are in the exact intended series/parallel relationships with the R5–R7 network is crucial for matching another target value.

Dashboard ENG1003:Analogue Electronics 1 (2024-25)

Calculate the total equivalent resistance for the circuit. Assume R3=10 Ω and R4=1.5 Ω.

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