NEC Construction Wiring Practice Exam 2026 - Free Practice Questions and Study Guide for Electrical Licensing

The method used to determine the cost of energy consumption for lamps involves calculating the total energy used over time and then applying the associated rate per unit of energy. This requires taking into account the total wattage in relation to the hours of usage and the energy rate.

The correct method involves multiplying the number of hours the lamps are in use by the rate of energy cost, and then dividing by the total wattage to convert the total energy consumption into a cost. This way, you are effectively calculating the total kilowatt-hours consumed and then applying the cost rate to arrive at the total expense.

Using this method allows for an accurate representation of how much it actually costs to run the lamps based on their usage. This calculation takes into consideration both the duration the lamps are powered on and their energy consumption characteristics, leading to a comprehensive understanding of energy costs associated with lighting.