Hi,

You have declared a frequency of 1Hz (i.e. one cycle per
second) for your source.

OK, now draw a sine wave with a triangular wave of the same
peak amplitude inside it. You should be able to see that the
initial slope (di/dt) of the triangle is much greater than one
amp per second, in fact it is four times that since it reaches
its peak in a quarter of a second. Now look at the sine wave - at
the crossing it is steeper than the triangle.


Cheers - Joe