31 – 33. An article in Scientific American pointed out that replacing a 75-watt incandescent bulb withan 18-watt compact fluorescent bulb would save about 75% in the cost of electricity. Electricity isgenerally priced per kilowatt-hour (kWh) and the rate is PhP 10/kW-h. Calculate how much moneyyou would save over the life of one compact fluorescent bulb (about 10,000 h). Note: Standardincandescent bulbs last about 750 h.

The explanation is given below-

Answered: 31 – 33. An article in Scientific…

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter10: Energy For Tomorrow: Solar And Other Renewable Energy Sources

Section: Chapter Questions

Problem 35E

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9.69 How are the roles of transmission substations and distribution substations in the electrical grid similar? How are they different?
The best solar panels currently available are about 15% efficient in converting sunlight to electricity. A typical home will use about 40. kWh of electricity per day (1 kWh = 1 kilowatt hour; 1kW = 1000 J/s). Assuming 8.0 hours of useful sunlight per day, calculate the minimum solar panel surface area necessary to provide all of a typical homes electricity. (See Exercise 124 for the energy rate supplied by the sun.)
Using the information thus far in this chapter, explain why battery-powered electronics perform poorly in low temperatures.
Fossil fuel, nuclear, and hydroelectric power plants all require a transmission network to transport electricity from where it is generated to where it is used. MCFCs, with their smaller size and portability, can be placed much closer to where the power is needed, reducing the need for transmission lines. With this in mind, explain why MCFCs may have a greater advantage for providing power in developing countries versus in developed countries.
Explain why hydroelectric power and wind power are indirect forms of solar energy.
Assume that electricity costs 15 cents per kilowatt- hour. Calculate the monthly cost of operating each of the following: a 100 W light bulb, 5 h/day a 600 W refrigerator, 24 h/day a 12,000 W electric range, 1 h/day a 1000 W toaster, 10 min/day
Which of the following is a renewable energy resource? (a) nuclear fusion (b) hydroelectric power (c) natural gas (d) coal
. How can you use a hair dryer to see the difference between electricity and electronics? O Electricity uses the movement of electrons, while electronics do not use electrons. Electronics and electricity are exactly the same. The terms are interchangeable. The hair dryer requires electronics in order to power the heat to dry your hair, while the electricity controls the circuit that does the drying. The hair dryer requires electricity in order to power the heat to dry your hair, while the electronics control the circuit that does the drying.
Albert Szent-Gyorgi, a pioneer in early photosynthesis research, stated, “What drives life is a little electric current, kept up by the sunshine.” What did he mean by this?
The total rate at which power is used by humans worldwideis approximately 15 TW (terawatts). The solar flux averagedover the sunlit half of Earth is 680 W/m2 (assumingno clouds). The area of Earth’s disc as seen from the Sun is1.28 x 1014 m2. The surface area of Earth is approximately197,000,000 square miles. How much of Earth’s surfacewould we need to cover with solar energy collectors to powerthe planet for use by all humans? Assume that the solar energycollectors can convert only 10% of the available sunlightinto useful power.
The total power used by humans worldwide is approximately 15 TW (terawatts). Sunlight striking Earth provides 1.336 kW per square meter (assuming no clouds). The surface area of Earth is approximately 197,000,000 square miles. How much of Earth's surface would we need to cover with solar energy collectors to power the planet for use by all humans? Assume that the solar energy collectors can only convert 10 % of the available sunlight into useful power.
How can solar cells be described by at least one of the Green Chemistry principles?

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