AP Physics 1 Question 304: Answer and Explanation
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2. What is the equivalent resistance of the electric circuit in the picture above?
- A. 0.46 Ω
- B. 1.2 Ω
- C. 4.5 Ω
- D. 14.5 Ω
Correct Answer: D
Remember that parallel resistors require you to use the reciprocal sum, while series resistors simply add. For example, the first set of parallel resistors would be combined by doing , which means R = 1 Ω. For the second set of parallel resistors, you would get , which means R = 1.5 Ω. Adding those two values to the lone series resistor gives RTotal = 2 + 1 + 1.5 = 4.5 Ω.