The power transformer is a
- A. Constant current device
- B. Constant voltage device
- C. Constant power device
- D. Pulsating main flux device
Answer: D. Pulsating main flux device
Explanation: In a power transformer, the core flux is alternating and pulsating sinusoidally (Φ = Φm sin ωt) to induce alternating EMFs in the windings.