What is the primary function of a capacitor on a distribution line?

The primary function of a capacitor on a distribution line is to improve the efficiency of the circuit. Capacitors are used to manage reactive power in electrical systems, which enhances the overall performance of the power system. When capacitors are connected to a distribution line, they help reduce the amount of reactive power that must be supplied by the generators, thus allowing the system to operate more efficiently.

By improving the power factor, capacitors help reduce losses associated with the transmission and distribution of electricity. When the power factor is closer to unity, the system uses power more effectively, which leads to decreased current flow in the conductors and subsequently lower losses due to resistance in the wires. This improved efficiency is beneficial for both the operation of the electrical network and cost savings for utility providers.

While capacitors can also play a role in voltage regulation and can indirectly support reduced power loss by improving the circuit's performance, the fundamental and most direct impact they have is on enhancing efficiency, making it the correct choice in this context.