Ohm's law

On Monday Power Comes in Many Forms was shown to provide the segue into voltage and current on Wednesday.

Wednesday picked up from the high head micro-hydroelectric project to introduce voltage and current. This term the front side definitions introduction ran too long and the class did not do more than two appliances. The class also did not visit the solar panel output display. This means that the lecture must be compressed if the panel is operation.

In retrospect the cause of the overly long definitions introduction remained unclear. As a result the presentation on appliances was also not shown. The double failure to work more appliances and visit the solar panel output should be remedied with a faster roll into that material. The presentation now has a complete front end introducing voltage, current, resistance, and power. 

The new ratcheting driver is too wide to open this multimeter. The Vapira CO2 kit includes the needed driver. A permanent replacement might be useful.

This is a more optimal arrangement as this enables easily inserting the ammeter into the circuit.

With heavy rain delaying arrival of the students, notes were preloaded onto the board.

Notes on the report format would be added later.


Finolla enters data read out by Lashanna


LizzyAnn entering data into Desmos on her phone

LizzyAnn working on her circuit 


LizzyAnn checking her circuit set up


Leann and Austin with four cells (batteries) in their circuit


Bennie and Lanve used the newer Klein multimeter

Tommylee has shown a penchant for working solo. He takes much more patient and careful measurements than other teams tend to.


Left board at 10:33 


Right board with laboratory report details filled in on the left


KC and Kyle work on a setting up a circuit. 


Valencia and Kayla set up their circuit.


Ariana and Meramy with an optimally set up circuit.


Brithney and Pamella


Just-Wesley records data gathered by KC, Kyle, and Kealoha


Valencia records data gathered by Kayla


The 11:00 section wrapped by 12:19, perhaps one of the fastest data gathering exercises. Batteries were pre-distributed. Each group received four batteries. Five data points were generated by using 0 amperes, 0 volts.


Right board

Comments

Post a Comment

Popular posts from this blog

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

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