Circuit Fundamentals — question 2 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.
Basic bench debugging with an ammeter and multimeter, no schematic errors assumed -- just a fault in an otherwise-correct parallel network.
You have two resistors in parallel across a 9V rail feeding a small module: R1 = 1kOhm and R2 = 2kOhm. You expect the rail to source about 13.5mA total. Instead your ammeter reads 4.5mA. What's the most likely explanation, and how would you confirm it using only a multimeter, without desoldering anything?