The unit ramp function has slope `1` [so the function is simply `V(t) = t`], starting from `t = 0` [so we need to multiply by `u(t)`], and passes through `(0, 0)`.

So the voltage function is given by:

`V(t) = t · u(t)`

The graph of the function is:

12-1-212tV(t)Open image in a new page

Graph of `V(t)=t · u(t)`, the unit ramp function.

Easy to understand math videos: