Which statement is true regarding the usage of capacitors in electrical systems?

Capacitors play a versatile role in electrical systems, and one of their primary functions is energy storage. When used in conjunction with motors, particularly single-phase induction motors, capacitors can provide the necessary phase shift to create a rotating magnetic field, which is crucial for starting the motor. This capability is particularly evident in applications where a starter capacitor is employed to give the motor an initial boost of energy, enabling it to start more effectively and efficiently.

The ability of capacitors to store energy allows them to release a significant amount of power rapidly when needed—such as during the starting phase of a motor. This action not only helps in starting the motor but also contributes to the smooth operation of the motor once it is running.

In contrast, while capacitors can be used in AC circuits, they are not limited to these applications, as they can also function in DC circuits. Their operation is not confined to high voltage systems either; capacitors are utilized across a range of voltage levels tailored to specific requirements. Similarly, while some motors do not require capacitors for starting, many types, especially in residential and industrial applications, benefit from their usage to improve performance and efficiency.