A.2.86A B.1.65A C.250A D.144.34A
A.0.3Ω B.0.6Ω C.0.15Ω D.0.075Ω
A.Fm=φ/Rm B.φ=Fm/Rm C.φ=Rm/Fm D.Fm=1/(Rm·φ)