Which term is defined as a primary power distribution point connected to a main power source?

• A. Bus bar
• B. Capacitor
• C. Circuit
• D. Commuter

Answer: (A)

In power distribution, the bus bar is the large, solid conductor that collects power from the main source and then feeds it out to the various downstream circuits. It serves as a central distribution point because it provides a single, common connection where multiple outgoing feeders meet, allowing high currents to be routed efficiently through switchgear and into transformers or feeders. This is exactly the role of a primary distribution point in many electrical systems used in transit power distribution.

Capacitors are energy storage elements used for tasks like filtering or improving power factor, not for distributing power from the main source. A circuit describes the complete path that current follows, typically a closed loop, rather than a single hub for distributing power. A commutator is a rotating device in DC machines that switches current direction in the rotor, not a stationary distribution point.