Potential Divider

Circuit:

Analysis:

$\frac{V - V_{out}}{1k} = \frac{V - 0}{1k + 1k}$

Solving, we get $V_{out} = \frac{V}{2}$

Simulation:

The simulation shows that it is the case, when $V$ change from 0 to 5, $V_{out}$ varies linearly with it, and when $V = 5$, $V_{out} = 2.5$.

LTSpice:

The model can be downloaded here.