Primary energy circuits

Captain Kirk surveys the sabotaged circuits

The primary energy circuits were important energy-production components aboard Constitution-class starships.

In 2267, Lieutenant Commander Benjamin Finney sabotaged the primary energy circuits on the USS Enterprise, making it impossible to restart the ship's impulse engines. As the ship was in orbit of a planet and in danger of spiraling down to the surface, this would have resulted in the destruction of the ship. Fortunately, threatened with the death of his daughter, who had been brought aboard the ship, Finney relented and informed Captain James T. Kirk where he had sabotaged the circuits, allowing Kirk to reverse the damage. (TOS: "Court Martial")

Although Finney refers to the circuits as the "primary energy circuits," Kirk later refers to them as the "prime energy circuits."
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