Electricity and Floral litmus solutions

For 121 in the morning I again opted not to cover magnetism but rather to focus on power, voltage, current, and resistance relationships. After running a series of examples of P = iV and V = iR on the board for various appliances, I took the class to visit an air conditioning unit.  The text has yet to be rewritten to take into account this shift in curriculum to a focus on electrical power usage, a shift that has also occurred during the regular term.


We worked out the power used by some of the split AC units. Some units are 1200 BTU 110 volt units, others are 2400 BTU 220 volt units. Then I took the class down to the library to see the solar panel output.



Risenta and Jimmy in the library.



By the time we reached the panel, the students had already been introduced to Watts, kiloWatts, DC, AC, and even to Celsius day time temperatures (chapter six and eight)



Notes on the board from the morning session. The other board was not imaged.



As I chose to do spring 2013, I used a decade resistance box to set up a linear relationship of voltage and current.



The voltage was varied by increasing the number of dry cell batteries hooked up in series.



Rock and Tracy study the ancient ammeter and voltmeter.



Risenta looks on from the left, Rockson, Jane Rose, and Tracy observe the voltage and current for four batteries in series.



The data which was gathered.



The very next day is chemistry. In a day. Welcome to physical science. A whole multi-hundred year field of study in a single day.



Sodium. Chloride. Sodium chloride. Hydrogen. Two. Oxygen. H2O.



Hydrogen and lithium.

The limes from the tree next to the house were too young to produce significant amounts of acid.



Tina Kephas.



Rose Ann, Tracy, Jane Rose.



Rose Ann, Tracy.



Jane Rose works on unknowns.



Elmihra and Kamleen.



Table set-up for lab 13.
Posted by Picasa

Comments

Post a Comment

Popular posts from this blog

Plotting polar coordinates in Desmos and a vector addition demonstrator

Image
In an earlier post I noted that Desmos did not directly plot polar coordinates. Not only was I incorrect, but Desmos responded to my blog to correct me! Although I had at some point seen that one could define a function f(x)=3x+5 and then have Desmos calculate f(6), I had not absorbed how this might be used to plot polar coordinates. The above works beautifully . Realizing that I could effectively program Desmos, I applied this thinking to demonstrating how to add two vectors when given the magnitudes m and the direction angles theta. The graph calculates the i and j components for the two vectors and then adds the vectors, graphically displaying the result while also providing information on the magnitude and direction of the vector sum. m1 and theta1 are the magnitude and direction angle for one of the two vectors, m2 and theta2 are the magnitude and direction for the other vector. All four are dynamically interactive and can be changed. The diagram purports to illustra...
Read more

Traditional food dishes of Micronesia

Image
Clara, Jennette, and Joanie presented ground hard taro cooked in an umw, effectively a hot rock oven. Pohnpeian: rotama. Pingelapese: sero. Mwoakillese: rodma. Mortlockese: Amahd. Kosrae: rodoma. After cooking in an umw the rotama is pounded with the petiole of a palm frond. Rotama is made from hard or swamp taro, known as mwahng on Pohnpei, mweian on Pingalap, pula in Mortlockese, and pahsruhk on Kosrae. In traditional times on the outer islands the women had primary responsibility for tending the taro while the men handled fishing and climbing tasks. Joesen and Noeleen presented fermented breadfruit from the outer islands of Yap such as Woleai and Eauripik. The raw ingredients were actually brought in from Yap, Noeleen prepared the maare.  The leaf wrap is ti leaf - Cordyline fruticosa. Pauleen, Barnson, Trisha, Verginia, Con-ray, and Maylanda from Kitti, Pohnpei brought in mahi umw, koahpnoair koakihr, and uht sukusuk. Above is breadfruit umw, mahi umw, o...
Read more

Setting up a boxplot chart in Google Sheets with multiple boxplots on a single chart

Image
The  Google Statistics  add-on for Google Sheets can display multiple boxplots in a single chart. The key is the layout of the data. One column should be the variable by which the data is to be grouped, the other column should be the data to be box plotted. Set up the Statistics add-on with the data to be plotted as the variable, and the grouping column as the "by" variable. In this image I had deselected all but the boxplot option, the result was the appearance of the Moment, Standard errors, and Confidence intervals options. The default is apparently a 95% confidence interval for the mean. The result is multiple boxplots on a single chart with a common scale. The new tab that is created also quotes 95% confidence intervals for the mean. Note that as of 2018 the Google Statistics add-on cannot be found by search in the add-ons. In addition, as of May 2018 the add-on no longer verifies, possibly due to the add-on not having been updated since August 2017. One may ha...
Read more