Step 4: As a quick informal test of the usefulness of the 3-D model building
methodology, a circuit similar to the one in Figure 6 can be presented to the students. For this study, the 10th grade students were asked to compare the electric potentials of points K, L, M and N in Figure 8. Most of the students (15 out of 22) could give the correct answer to this question. Parenthetically the achievement test didn’t include this question.