电源电压：\r\nU＝RI＝242×0.91≈220(V)\r\n灯泡功率：\r\nP＝UI＝220×0.91≈200(W)\r\n通过电阻165欧姆的电流：\r\nI＝U\/R＝220\/165≈1.33(A)\r\n灯泡功率：\r\nP＝220×1.33≈293(W)\r\n电路总电流：\r\nI＝0.91＋1.33＝2.24(A)\r\n电路总功率：\r\nP＝200＋293＝493(W)