Nate Electrical Practice Exam 2026 - Free Electrical Practice Questions and Study Guide

The function of a run capacitor in a motor is to increase the torque by improving the efficiency and performance of the motor during its operation. When a motor is running, the run capacitor is connected in series with the winding, and it creates a phase shift in the current. This phase shift generates a rotating magnetic field, which contributes to the torque produced by the motor.

The increased torque results in better starting performance and can help the motor handle variations in load without experiencing stalling. Consequently, the motor can operate more smoothly and efficiently under normal running conditions. The other options do not accurately describe the primary role of the run capacitor; it is not specifically designed to increase horsepower directly, decrease resistance, or increase amperage, although it may have some indirect effects in those areas. However, the key function remains enhancing torque for optimal motor performance.