Lighting a school with less energy

Question 3: Analyze an environmental problem doing calculationsAbout 23 minutes · 10 points

Westfield High School has 1,200 light fixtures, each with a 60-watt (W) incandescent bulb. The lights are on for 2,500 hours each year. The school plans to replace every bulb with a 9-watt LED bulb that gives the same amount of light. The school pays 0.15 US dollars per kilowatt-hour (kWh) of electricity, which comes from a coal-fired power plant. (1 kWh = 1,000 watt-hours.)

(A) Explain why an incandescent bulb uses much more electricity than an LED bulb to produce the same amount of light. 1 point

(B) Calculate the electricity, in kWh, that the incandescent bulbs use in one year. Show your work. 2 points

(C) Calculate the amount of money, in US dollars, the school will save on electricity each year after replacing all the bulbs with LEDs. Show your work. 2 points

(D) Calculate the percent change in the electricity the school uses for lighting after the switch to LEDs. Show your work. 2 points

(E) Identify one air pollutant, other than carbon dioxide, that is released when coal is burned to generate electricity. 1 point

(F(i)) Propose one other realistic way the school could reduce the electricity it uses. 1 point

(F(ii)) Justify the solution proposed in part F(i) by explaining one advantage of it other than lowering the school's electricity bill. 1 point