USCG Exam PracticeDC circuits and electronic principles
An inductive DC circuit has L = 0.5 H and a series resistance of 25 Ω. Approximately how long after the source is applied will the current reach 63% of its steady-state value?
- A. 12.5 seconds
- B. 0.1 seconds
- ✓ 0.02 secondsCorrect
- D. 50 seconds
Why C is correct
NEETS Mod. 2 §2-2: the RL time constant T = L/R = 0.5/25 = 0.02 seconds. In one time constant the current reaches approximately 63% of its final value. The other options result from inverting the formula or misapplying the RC formula.
Cited:NEETS Mod. 2 §2-2