Get Wired 102 Introduction to the Basic Installation of Lighting Fixtures and Branch Circuits Practice Test 2026 - Free Practice Questions and Study Guide

In a series circuit, current flows through a single path, so the same amount of charge passes every component in turn. That means the current is identical at every point along the loop, while the voltages across individual components can differ based on each one's resistance. The current is determined by the total resistance in the loop and the source voltage, but it does not change from one component to the next.

If you think it could be false, imagine there were branches—then current could split. But a true series circuit has no branches, so the current cannot change as it moves along. The idea that it depends on resistance is mixing up how voltage divides; the current itself remains the same even though each component may drop a different voltage. Saying it cannot be determined is also wrong, since you can calculate the current from Ohm’s law using the source voltage and the total resistance.