Question 1038 of 749 · Maryland Journeyperson Electrician Exam
A series AC circuit has 3 ohms of resistance and 4 ohms of inductive reactance. What is the impedance?
Exactly one answer is correct.
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Correct answer to question 1038
- B: 5 ohms
Explanation
Resistance and reactance are 90 degrees apart, so they add as vectors: Z = square root of (3 squared + 4 squared) = square root of 25 = 5 ohms. Adding them directly (7 ohms) is a common mistake.
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