因为电源有电动势啊.而这个电动势来源于非电场力.比如发电机,磁通量的变化就会在两个电极上产生电动势.
你问的我比较发懵
猜你喜欢
- 1If jack and his father go to see she show ,how much they spend?
- 2一个蔗糖分子（C12 H22 O11由几个原子构成 45个吗
- 3一个圆柱体和一个圆锥体等底等高，它们的体积相差50.24立方厘米．如果圆锥体的底面半径是2厘米，这个圆锥体的高是多少厘米？
- 4英语翻译
- 5when and where to go for the on-slary holiday___yet
- 6暴风雨的启示阅读答案
- 7We_____ sandcastles at the beach this weekend.(make)
- 8milk是可数性名词还是不可数性名词
- 9I will always choose to believe you、什么意思?
- 10is this___your pencil case?A Yes,this is B no,it isn't C.