已知通过电阻<img src="https://static.zxtiku.com/wangke/imgs/topic/c1f984ea4cb1eb114349357618b57cf5.png"/>的可变电流的强度<img src="https://static.zxtiku.com/wangke/imgs/topic/ebdce0c605c4fa59a8211f324b4f7d86.png"/>是时间<img src="https://static.zxtiku.com/wangke/imgs/topic/591ec9aff39ac2e8842bdcc7931b14e2.png"/>的函数<img src="https://static.zxtiku.com/wangke/imgs/topic/1fb8fd6d6a585ac72cacd63f72feca83.png"/>，则从时间<img src="https://static.zxtiku.com/wangke/imgs/topic/2ebde49dffbb70a808946d4e848952e6.png"/>到<img src="https://static.zxtiku.com/wangke/imgs/topic/6e4a9276ae62f2a57a1f10a187cbf84d.png"/>电流所做的功<img src="https://static.zxtiku.com/wangke/imgs/topic/edb95c8b92d233e261d686f4c86049e9.png"/>．‏