Circuit Fundamentals — question 5 of 10
Write a real answer. It is graded against the question's rubric, and the mastery movement is computed by the same engine the product uses. Scoring here is deterministic rather than model-written, so this page costs nothing to run and nothing is saved. In a track built from your own posting, the same rubric is graded by the model, which is what produces feedback about your reasoning rather than about coverage.
A simple three-branch resistive summing node -- the kind of circuit you'd sketch on a whiteboard to check before building it.
You're combining two logic-level signals into a single bias voltage for a comparator input using a passive resistor summing network (no op-amp). Rail A sits at 10V through a 2kOhm resistor, Rail B sits at 4V through a 2kOhm resistor, and both tie together at a common node that also has a 4kOhm resistor to ground. Using node analysis, what voltage appears at that common node?
This one resolves to a number. Give the value in the field below and your reasoning in the box — the number is checked exactly, by arithmetic.