USCG Exam PracticeDC circuits and electronic principles
An inductive DC circuit has an inductance of 4 H and a series resistance of 2 Ω. Approximately how long after the source is connected will the current reach 63% of its final steady-state value?
- A. 0.5 seconds
- ✓ 2 secondsCorrect
- C. 8 seconds
- D. 10 seconds
Why B is correct
The RL time constant T = L/R = 4 H / 2 Ω = 2 seconds. By definition, the current reaches approximately 63% of its final value in one time constant. (NEETS Mod. 2 §2-2)
Cited:NEETS Mod. 2 §2-2