A transformer secondary is connected to pure resistive load. The power factor on the primary side will be
- A. near about 0.95 lead
- B. near about 0.95 lag
- C. zero
- D. unity
Answer: B. near about 0.95 lag
Explanation: Due to the magnetising current drawn by the transformer core (which lags by 90°), primary power factor is slightly lagging (~0.95 lag) even with resistive secondary load.