Final answer:
The compact fluorescent light (CFL) bulb uses 15 W to produce the same amount of light as a 60-W incandescent bulb. Operating a CFL for 1000 hours costs $1.95 in electricity and bulb costs combined, making it much more cost-effective and environmentally friendly compared to incandescent bulbs.
Step-by-step explanation:
The compact fluorescent light (CFL) bulb is designed to replace a 60-W incandescent bulb with the same light output while using only one-quarter of the wattage. In specific terms, a CFL bulb capable of producing the same light intensity as a 60-W incandescent bulb typically consumes 15 W of power. This significant improvement in efficiency not only leads to cost savings but also contributes to environmental conservation by reducing electricity consumption.
In the example problem, the total cost of operating a 60-W incandescent bulb for 1000 hours at an electricity cost of 12 cents per kWh is compared to that of a CFL. Since the CFL bulb uses only 15 W and lasts 10,000 hours, its electricity cost for 1000 hours will be $1.80 given the same per kWh rate. Adding the prorated investment cost of the CFL bulb ($0.15 for 1000 hours when it costs $1.50 and lasts 10,000 hours), the total cost to operate the CFL for 1000 hours comes to $1.95.
Therefore, cost effectiveness, environmental impact, and investment are all significantly better with the use of CFL bulbs despite a higher initial purchase price. Commercial establishments that consider the additional labor costs for more frequent bulb replacements might find even greater benefit in using longer-lasting CFLs.