短路时 根据I=U/R 外电路电压为0,那么电流不就是0吗?但是 E=I(R+r)U外=E-Ir U外为0那么电流也不是0啊?到底怎么判断啊?
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![短路时 根据I=U/R 外电路电压为0,那么电流不就是0吗?但是 E=I(R+r)U外=E-Ir U外为0那么电流也不是0啊?到底怎么判断啊?](/uploads/image/z/6579905-41-5.jpg?t=%E7%9F%AD%E8%B7%AF%E6%97%B6+%E6%A0%B9%E6%8D%AEI%3DU%2FR+%E5%A4%96%E7%94%B5%E8%B7%AF%E7%94%B5%E5%8E%8B%E4%B8%BA0%2C%E9%82%A3%E4%B9%88%E7%94%B5%E6%B5%81%E4%B8%8D%E5%B0%B1%E6%98%AF0%E5%90%97%3F%E4%BD%86%E6%98%AF+E%3DI%28R%2Br%EF%BC%89U%E5%A4%96%3DE-Ir+U%E5%A4%96%E4%B8%BA0%E9%82%A3%E4%B9%88%E7%94%B5%E6%B5%81%E4%B9%9F%E4%B8%8D%E6%98%AF0%E5%95%8A%3F%E5%88%B0%E5%BA%95%E6%80%8E%E4%B9%88%E5%88%A4%E6%96%AD%E5%95%8A%3F)
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