【简答题】基尔霍夫第(__)定律又称电压定律,规定环绕的正方向,并并标定电流后,“电阻上的电压降与电动势之和等于零”中必然规定了电流与环绕方向一致该电阻的的电压降为正,环绕方向从电源的(__)极进入,电动势为正,环绕方向从电源的(__)极进入,电动势为负。
【判断题】理想电流源的输出电流是一个与端电压和电流的正方向,但不能规定电动势的方向。()
【单选题】We ran to the trees, ___ we couldn't see any more monkeys.
【单选题】It was so dark that we couldn't see each other 's faces .
【单选题】We couldn't see _____ because the light in the room was poor. [ ]
【简答题】电动势的单位与电压单位相同,也是伏特(V)。电动势是一个标量,同电流一样也有自己的规定方向,即规定:自负极通过 ________ 到正极的方向为电动势的方向。
【单选题】We couldn't see_____ because the light in the room was poor.
【单选题】It was do dark that we couldn't see each other 's faces .
【判断题】电动势的方向与电压一样,都是从正极指向负极( )