A.8.7KW B.17.4KW C.15KW D.26KW
A.i=10sin(ωt+30°)A B.i=10sin(ωt+120°)A C.i=10sin(ωt-60°)A D.i=10cos(ωt-30°)A
A.220V B.380V C.311V D.380√2V