What is the equivalent resistance between the terminals A and B? [Figure description: A current source I at the bottom drives a circuit made of four resistors, each marked/understood as 2 Ω (one labelled 2Ω), arranged as a bridge: the top branch has two resistors in series (left and right of a vertical centre line), the bottom branch has two resistors in series; terminals A (upper) and B (lower) are the mid-point nodes of the top and bottom branches respectively, drawn as two dots on the central vertical line with no element between them in the picture. The left and right ends of the top and bottom branches are joined and connected through the outer loop to the current source I.]
- A. 2.5 Ω
- B. 2.83 Ω
- C. 3.33 Ω
- D. 2.86 Ω
Answer: D. 2.86 Ω
Explanation: With the current source deactivated (open circuited), delta-wye conversion of the symmetric bridge gives equivalent resistance Rab = 2.86 Ω.