How is the energy consumption for all lamps calculated?

The calculation of energy consumption for all lamps is based on the amount of power they use over a specific time period. To determine this, you multiply the total wattage of the lamps by the number of hours they are operated. This approach directly reflects the principle that energy consumption (measured in watt-hours) equals power (in watts) multiplied by time (in hours).

This formula is essential when analyzing the energy usage in residential or commercial settings, as it allows users to estimate their electricity bills and manage usage more effectively. By understanding this relationship, one can make informed decisions about energy efficiency and conservation practices.

The other options do not provide an accurate method for calculating energy consumption. Dividing total watts by hours does not yield energy consumed; it misrepresents the relationship. Multiplying total watts by the energy rate calculates cost rather than energy used, while combining total watts with voltage does not produce a valid measurement of energy consumption.