A.Z=2πf·L B.Z=XL+R C.Z=(XL+R) D.Z=(XL+R)1/2221/2
A.XL=2πL B.XL=1/2πL C.XL=2πf·L D.XL=IR
A.0.5(50%) B.0.75(75%) C.1(100%) D.0.25(25%)