CSWA Electrical Practice Exam 2025 - Free CSWA Electrical Practice Questions and Study Guide

A capacitor bank is a collection of capacitors that are connected together to provide reactive power support in electrical systems. Capacitors store electrical energy in an electric field and can release it when needed, which is essential for maintaining voltage levels in power systems and improving overall system stability. By using a group of capacitors, a capacitor bank can adjust the reactive power in the network, thereby enhancing power quality and efficiency.

This is particularly important in industrial and commercial applications where large motors or other inductive loads can cause a lagging power factor, leading to inefficiencies in the power system. The capacitor bank compensates for this inductive load by supplying reactive power, thus helping to balance the system and reduce losses.

In contrast, a single capacitor would merely provide localized energy storage without the broader system benefits, while a collection of resistors does not serve the purpose of reactive power management. Additionally, inductors would not be suitable in this context as they are primarily used to restrict current flow rather than to provide capacitance-based effects.