AP Physics 1 Question 280: Answer and Explanation

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Question: 280

7. What is the current through the 8 Ω resistor in the circuit shown above?

  • A. 0.5 A
  • B. 1.0 A
  • C. 1.5 A
  • D. 3.0 A

Correct Answer: D



Since points a and b are grounded, they're at the same potential (call it zero).

Traveling from b to a across the battery, the potential increases by 24 V, so it must decrease by 24 V across the 8 Ω resistor as you reach point a. Thus, I = V/R = (24 V)/(8 Ω) = 3 A.