Tricky but interesting circuit problem ?
Find the voltage across terminals a and b, Vab
- Anonymous1 month ago
2R is by-passed
Req = 4R // 4R = 2R
Vab = V*Req/(Req+R) = V*2/(2+1) = 2V/3
- Dr. ZorroLv 71 month ago
Without thinking, I would say answer A) is correct ;-)
RealPro gave the full analyses. The trick is to spot the short circuited resistor (2R).
- RealProLv 71 month ago
You ignore the 2R resistor because the current bypasses it through the leftmost wire. Resistance between A and B is (R+3R=4R) parallel to 4R which is 2R in total.
The resistance of the whole circuit is 3R.
2/3 of the circuit resistance is between A and B so 2V/3.