∵P= U2 R ,∴灯泡电阻R= U P额 = (220V)2 25W =1936Ω,灯泡的实际功率:P1= U R = (240V)2 1936Ω ≈29.75W>25W,P2= U R = (210V)2 1936Ω ≈22.78W<25W;把灯接入220V电路时,灯正常发光,实际功率等于额定功率.故答案为:大于;小于;等于.