The full load copper loss and iron loss of a transformer are 6400 W and 5000 W respectively. the copper loss and iron loss at half load will be , respectively

1. 3200 W and 2500 W
2. 3200 W and 5200 W
3. 1600 W and 1250 W
4. 1600 W and 5000 W

Answer: 1600 W and 5000 W