Avionics Electronics Technician (AET) Exam 2025 – 400 Free Practice Questions to Pass the Exam

A faulty resistor in an electrical circuit can lead to open circuit behavior, which occurs when the resistor ceases to function properly, resulting in a break in the flow of current. This can happen if the resistor becomes disconnected or if its resistance value changes significantly due to damage.

When a resistor fails, it may not allow current to flow at all, similar to a blown fuse, which effectively interrupts the circuit. This disruption affects the entire operation of the circuit, preventing it from functioning as designed. The other options describe scenarios that might create different issues in a circuit; for instance, increased current flow or short circuit conditions generally imply a failure that reduces resistance, which is not what happens with a faulty resistor that becomes open. Lastly, stable voltage output is not achievable when a resistor is faulty because the integrity of the circuit's components directly influences voltage levels.