Use the 6 steps (Clarify, Present, Hypothesize, Calculate, Intuit, and Validate)

Question

Use the 6 steps (Clarify, Present, Hypothesize, Calculate, Intuit, and Validate) to solve these questions. Specify any information you gathered and cite the source of that information. If you find the answer for one of these questions directly from a website, you must reproduce the work to show you understand the concept fully. These problems will require some external research.

1. A bike light lasts 10 hours and consumes 1 Watt of power. What is the capacity rating of the battery, in Coulombs? What is the electrical cost to operate this light for 10 hours? You can use any rating of the light used in bike, it just has to make sense.

2. What costs more, a package of top ramen or the heat to cook the top ramen with an electrical stove or hotplate?

3. What is the cost to drive an electric car 100 miles? How many miles would have to be driven for an electric car of your choice to equal the cost of a conventional gas car of your choice?

4. How much does the electricity cost to binge watch the entire series of "The Office" on a laptop or desktop computer. Season 5 of "The Office" had 9 million estimated viewers. How much coal would it take to generate the electricity for 9 million viewers to watch the entire series of "The Office"?

NOTE: YOU ARE ALLOWED TO USE ANY COST FOR THE QUESTIONS, IT JUST HAS TO MAKE SENSE.

Explanation / Answer

2. Cooking over a hotplate/electric stove costs much lesser than a packet of noodles. The energy conversion efficiency of the hotplate /electric stove is much higher that might cost you much lesser.

3.it would cost charging of the battery of the car alone and the efficiency of the battery. The next part of the question demands one answer: how is the gas to electricity charges in ratio in your nation.

4.it would take the amount of electricity required to charge the laptop / regardless of what we are watching. And the amount of goal required to generate the power (that depends on the no.of users*no.of hours).We multiply how much power it uses in kilowatts, by the number of hours in a year. That gives 0.1 kW x 8,760 hours or 876 kWh.

The thermal energy content of coal is 6,150 kWh/ton. Although coal fired power generators are very efficient, they are still limited by the laws of thermodynamics. Only about 40 percent of the thermal energy in coal is converted to electricity. So the electricity generated per ton of coal is 0.4 x 6,150 kWh or 2,460 kWh/ton.To find out how many tons of coal were burned for our laptop/desktop.we divide 876 kWh by 2,460 kWh/ton. That equals 0.357 tons. Multiplying by 2,000 pounds/ton we get 714 pounds (325 kg) of coal.

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