如果用Stokes定理计算的话，电场对一条封闭曲线做的功，比如说，电厂中有一个金属线圈，想要知道金属线圈的电压是多少。
If we apply Stokes' theorem to compute the work done by the electric field around a closed curve, that means you have a wire in there and you want to find the voltage along the wire.
此时在A点和B点的电压分别是多少？
当它被合上时，不管流经开关元件的电流值是多少，电压恒为零。
When a switch is closed, the voltage across the switch is identically equal zero regardless of the current through the switch.
当它被合上时，不管流经开关元件的电流值是多少，电压恒为零。
When a switch is closed, the voltage across the switch is identically equal zero regardless of the current through the switch.
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