A Lighthouse That Serves a Dangerous Coastal Area Is Built

question 31

Multiple Choice

A lighthouse that serves a dangerous coastal area is built. The lighthouse cost $500,000 to build and serves 500 ships a month. If the shipping in the area increases so that 750 ships pass by a month, the increase in additional costs of providing the light to these new ships is

• A) $500,000.
• B) $250,000.
• C) $250.
• D) $0.

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Definitions:

Phase Currents

The electric current flowing through one phase of a multi-phase system.

Neutral Conductor

The conductor in an electrical system that is grounded and carries current only under fault conditions, providing a path for current to return to its source in a balanced system.

True-RMS Indicating Ammeter

An electrical measuring instrument that accurately measures the root mean square (RMS) of a varying current, reflecting true power even in non-sinusoidal situations.

Average-Indicating Ammeter

A device used to measure the average current flowing through a circuit.