Final answer:
To find a point at a selected voltage on the teledeltos paper, use a probe to measure the voltage at different points and mark the location of the point on a white photocopied page. The voltage measured depends on the potential difference between two points.
Step-by-step explanation:
To find a point at a selected voltage on the teledeltos paper, you would need to use a probe to measure the voltage at different points and mark the location of the point on a white photocopied page. The voltage measured depends on the potential difference between two points. You can use the grid marks on the black paper to help transfer your readings onto the photocopy.