當 secondary coil 未連接電阻時, 佢ge pd 係100v
但係一通左電(連接電阻)時, 電流 (I) 上升, 但係點解佢GE change of magnetic flux 會下降,(i.e. 係primary 同secondary coil供電電壓下降)?
更新1:
我希望大家可以用phy 角度解答呢一個問題, thx