Question 34
Current ElectricityFrom the diagram above, determine the value of the resistance X.
- A.9Ω
- B.12Ω
- C.15Ω
- D.6Ω
Show the answer and explanation
Answer: C (15Ω)
Explanation
Total resistance = 12 V ÷ 2 A = 6 Ω, so the parallel pair is 6 − 2 − 1.5 = 2.5 Ω. 3X/(3 + X) = 2.5 gives X = 15 Ω.