Question

An 11.0 -W energy-efficient fluorescent lightbulb is designed to produce the same illumination as a conventional 40.0-W incandescent lightbulb. Assuming a cost of 0.110 kWh for energy from the electric company, how much money does the user of the energy-efficient bulb save during 100h of use?

Answer 1

The amount or cost that the user of the energy-efficient bulb save during 100h of use will be $0.319.

How to calculate the cost?

For the 11.0W bulb, it should be noted that the value will be:

= 11.0 × 100 × (1/1000) × 0.110

= $0.121

The 40W bulb will be:

= 40 × 100 × (1/1000) × 0.110

= $0.44

Therefore, the amount that will be saved will be:

= $0.44 - $0.121

= $0.319

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