In a transformer, exciting current is made up of two components namely magnetizing current IM and core loss current IC, with negligible leakage impedance drop (V is supply voltage)
- A. Both IM and IC lag supply voltage V by 90°
- B. Both IM and IC are in phase with V
- C. IM lags V by 90° whereas IC is in phase with V
- D. IM is in phase with V but IC lags V by 90°
Answer: C. IM lags V by 90° whereas IC is in phase with V
Explanation: The magnetizing current IM produces the core flux and lags supply voltage V by 90°, whereas the core loss component IC is in phase with V supplying active iron losses.