In a circuit with a 12 V source and a total resistance of 667 Ω, the current is approximately which?

In a circuit with a 12 V source and a total resistance of 667 Ω, the current is approximately which?

• A. 0.006 A
• B. 0.012 A
• C. 0.018 A
• D. 0.024 A

Answer: (C)

Current follows Ohm’s law: I = V / R. With a 12 V source and 667 Ω resistance, I = 12 / 667 ≈ 0.018 A, which is about 18 milliamps. Since 12/700 is about 0.0171 A and 667 is a bit smaller than 700, the result being a touch larger makes sense, around 0.018 A. The other numbers would imply quite different resistances (for example, 0.006 A would need about 2000 Ω, 0.012 A about 1000 Ω, and 0.024 A about 500 Ω).

Current follows Ohm’s law: I = V / R. With a 12 V source and 667 Ω resistance, I = 12 / 667 ≈ 0.018 A, which is about 18 milliamps. Since 12/700 is about 0.0171 A and 667 is a bit smaller than 700, the result being a touch larger makes sense, around 0.018 A. The other numbers would imply quite different resistances (for example, 0.006 A would need about 2000 Ω, 0.012 A about 1000 Ω, and 0.024 A about 500 Ω).