①U1= I1 R1 =0.4安×15欧=6伏                         2分
②P1=U1I1=6伏×0.4安=2.4瓦                           2分
③能                                              1分
向右                                            1分
3                                               1分
3；15；0.9安                                    2分
(或3；3；1.125安 2分)