我们知道 ,正电荷定向移动的方向规定为电流方向 ,而负电荷定向移动的方向跟电流方向相反。但是 ,在判断电流方向时 ,同学们往往不知道是什么电荷在移动形成电流 ,因此对电流的方向的判断常出现错误。现介绍一种用电荷平衡法来判断电流方向的方法。所谓电荷平衡法是指正电荷总 We know that the direction in which the positive charge moves is defined as the direction of the current, and the direction in which the negative charge moves is opposite to the direction of the current. However, when judging the direction of the current, students often do not know what charge is moving to form a current, so the judgment of the direction of the current is often wrong. A method for determining the direction of current using the charge balance method is described. The so-called charge balance method means the total positive charge