USCG Exam PracticeAC circuits and theory
In an AC circuit containing only resistance, what is the phase relationship between voltage and current?
- A. Current leads voltage by 90°.
- B. Current lags voltage by 90°.
- ✓ Voltage and current are in phase.Correct
- D. Current lags voltage by 45°.
Why C is correct
In a purely resistive circuit there is no reactance to shift the current, so voltage and current reach their corresponding values simultaneously — they are in phase. Phase shift is introduced only by inductance or capacitance. (NEETS Mod. 2 §1-2)
Cited:NEETS Mod. 2 §1-2