To him, the current of his time was to be his current, lead where it might.

对他来说，时代的潮流就是他的潮流， 引领潮流。

In this case, current leads voltage by 90 degrees, changing the direction ahead of the voltage source.

在这种情况下，电流超前电压 90 度，改变了电压源前面的方向。