Question 45
Current ElectricityAn electrical circuit of Fig. 11 is connected up as shown; which of the following is the correct value of the current through the 1 ohm resistance?
- A.12/13 A
- B.13/12 A
- C.1/3 A
- D.3 A
- E.12/7 A
Show the answer and explanation
Answer: D (3 A)
Explanation
There are two 6 Ω paths (3 Ω + 3 Ω each) in parallel, giving 3 Ω, in series with the 1 Ω resistor: total 4 Ω. All the current passes through the 1 Ω resistor: I = 12/4 = 3 A.