A 100A19 that operates 1200 hours a year is replaced by a 25w retrofit CFL: at 10C per KW, what are the annual savings?

To determine the annual savings achieved by replacing a 100W A19 incandescent bulb with a 25W retrofit CFL, it is essential to calculate the energy consumption of both bulbs and the corresponding cost savings over the course of a year.

First, calculate the annual energy usage of the 100W incandescent bulb:

1. Power consumption in kW: 100W = 0.1 kW

2. Operating hours per year: 1200 hours

3. Annual energy consumption: 0.1 kW x 1200 hours = 120 kWh

Next, calculate the cost of operating the incandescent bulb:

Cost = Energy consumption (kWh) x Cost per kWh

= 120 kWh x $0.10 = $12.00 per year.

Now, calculate the annual energy usage of the 25W CFL bulb:

1. Power consumption in kW: 25W = 0.025 kW

2. Annual energy consumption: 0.025 kW x 1200 hours = 30 kWh

Next, calculate the cost for the CFL bulb:

Cost = 30 kWh x $0.10 = $3.00 per year.

Now, subtract the cost