Ch6_ChungA

toc =**Lesson 1 - Basic Terminology and Concepts**=

Motion is a very interesting thing. This is because we can model it and think about it in various different ways. In the past, we have stuck to traditional free body diagram methods. However, it is possible to solve motion problems in terms of work and energy. Work is when a force causes a displacement in an object. There are three parts to work: force, displacement, and cause. We can model work using the equation W = F x d x cos(x).
 * Perspectives**

=**Electric Bill**=

__Data Tables:__

__In watts:__
 * Timex Clock || AC 120 V 60 Hz 4W ||
 * iPhone charger || 100-240 V, ~50/60 Hz, .15A ||
 * Pencil sharpener || 120V, 12A ||
 * Router || 1.25 A ||
 * Telephone || 6.5V, 500 mA ||
 * Bose sound dock || 20 V ||
 * Laptop charger || 240 V ||
 * Apple TV || 240 V ||
 * Camera || 8.1 V ||
 * Mac Pro || 218 Watts ||

Mac Pro – 218 Watts Timex Clock – 4 Watts iPhone Charger – 18 Watts Pencil Sharpener – 1440 Watts Router – 150 Watts Telephone – 60 Watts Bose sound dock – 50/60 Watts Laptop charger – 15 Watts Apple TV – 2.06 Watts Camera – 5 Watts

__ Total kWh of power consumed: __
 * 1) Mac Pro – 7 Hours
 * 2) Timex – 24 Hours
 * 3) iPhone – 3 Hours
 * 4) Pencil – .2 Hours
 * 5) Router – 24 Hours
 * 6) Telephone – 3 Hours
 * 7) Bose sound dock - .01 Hours
 * 8) Laptop charger – 9 Hours
 * 9) Apple TV – 1 Hour
 * 10) Camera - .01 Hours

__ kWh used per day: __
 * 1) Mac Pro – 7 x 218 = 1526 Wh = 1.526 kWh
 * 2) Timex: .004 x 24 = .096 kWh
 * 3) iPhone charger: .018 x 3 = .054 kWh
 * 4) Pencil: 1.440 x .2 = .288 kWh
 * 5) Router: .15 x 24 = 12
 * 6) Telephone: .06 x 3 = .18 kWh
 * 7) Bose: .05 x .01 = .0005
 * 8) Laptop charger: .015 x 9 = .135
 * 9) Apple TV: .00206 x 1 = .00206
 * 10) Camera: .005 x .01 = .0005

__Total kWh used per day:__

14.2821 kWh

__What does this cost your parents?__

$440.34 in Total Electric charges

__Household electric bill:__

Total amount due: $440.34 or $289.01 for just the Supply

kWh consumed that month: 2329 kWh

__Cost of Electricity:__

__ Calculate the average cost per kWh by dividing the dollar amount by the kWh consumed. This is approximately what each kWh costs your family. (Note: this figure includes fees and taxes, too). The cost will probably be between $0.10-$0.20 per kWh – depending on how much electricity you use. Electricity costs more if you exceed a certain usage. __ 440.34 / 2329 = $.189 per kWh

289.01/2329 = $.124 per kWh

__ You can also look this value up on the bill itself. __

$.124092 per kh

__ Compare the two values. Why are they different? __

The first value in Part A is different than the actual value. This is because it adds in the cost of the delivery, which is where this company really gets you with the cost. Using the dollar cost for just the supply, the value is almost identical to the actual average bill per kWh.

__ Multiply the kWh you use per day by the cost per kWh to determine what you cost your parents. __

$.124 x 14.2821 = $1.77

**EVALUATE:**

__ Does the cost of electricity seem like a lot to you? Discuss this with your friends. __

The cost of electricity seems reasonable to me. I find it a bit off that PSE&G takes so much money from delivery charges. However, it is important to remember that they //are// a company and thus need to make money through other means than simple supply. I also think that the cost of electricity seems reasonable because a lot of it is tied into how much electricity you actually choose to use. Thus, the more electricity you consume the higher the cost will be. This seems fair.

__ Keep in mind that this cost only reflects ten appliances. What do you think your total cost actually is? Are there major appliances that you may have excluded from your list of ten that would make a big difference? __

I do not think that my total cost will be much different from the cost that I calculated. This is because the ten items that I chose to include consume the most of my electricity. Anything else would have a negligible impact on the total cost.

__ If you think your consumption is a lot – what can you change? Do you need/should change? __

I do not think that my consumption is a lot. I use electricity to the same amount that most other people use electricity. However, if I were to change I would start by evaluating which electrical appliances needed to be plugged in. Leaving things plugged in when they are not in use wastes a lot of electricity. Thus, I would unplug these electrical tools. I would also completely power off electrical tools that are not in use. All things considered, however, I think that my electrical usage is not above the norm.


 * HOMEWORK:**

__Paragraph:__

I thought that this lab really helped me think about electricity in a different way. Prior to today, electricity had always been something that my parents talked about but that I really had no knowledge of. I thought it was annoying when my mother would tell me to power down appliances and I subsequently chose not to do so on more than one occasion. "Saving electricity" seemed more like a nuisance than something actually worth doing. This all changed when I started examining my electric bill in greater depth. For the first time, I could truly see the effects of my TV watching and my cellphone charging. Everything that I did that required electricity was meticulously accounted for and applied to a certain cost. I now realize the importance of conserving electricity. I have also gained a greater appreciation for the use of power in homes. I am extremely interested to see where I lie relative to other families. I feel as if I do not use much electricity, but it would be nice to get an over or under when comparing myself to the average for my town.