An example of simplifying a seemingly complicated resistor circuit. Created by Willy McAllister.
- Subject:
- Physical Science
- Physics
- Material Type:
- Lesson
- Provider:
- Khan Academy
- Provider Set:
- Khan Academy
- Author:
- Sal Khan
- Date Added:
- 06/01/2021
An example of simplifying a seemingly complicated resistor circuit. Created by Willy McAllister.
This quarter-long project forms the basis of a third-year course for majors and nonmajors at the University of Washington, Bothell called Science Methods and Practice. Students use databases to identify novel research questions, and extract data to test their hypotheses. They frame the question with primary literature, address the questions with inferential statistics, and discuss the results with more primary literature. The product is a scientific paper; each step of the process is scaffolded and evaluated. Given time limitations, we avoid devoting time to data collection; instead, we sharpen
students' ability to make sense of a large body of quantitative data, a situation they may rarely have encountered.
We treat statistics with a strictly conceptual, pragmatic, and abbreviated approach; i.e., we ask students to know which basic test to choose to assess a linear relationship vs. a difference between two means. We stress the need for a normal distribution
in order to use these tests, and how to interpret the results; we leave the rest for stats courses, and we do not teach the mathematics. This approach proves beneficial even to those who have already had a statistics course, because it is often the first time
they make decisions about applying statistics to their own research questions.
We incorporate peer review and collaborative work throughout the quarter. We form collaborative groups around the research questions they ask, enabling them to share primary literature they find, and preparing them well to review each other's writing. We encourage them to cite each other's work. They write formal peer reviews of each other's papers, and they submit their final paper with a letter-to-the-editor highlighting how their research has addressed previous feedback.
A major advantage of this course is that an instructor can easily modify it to suit any area of expertise. Students have worked with data about how a snail's morphology changes in response to its environment (Price, 2012), how students understand genetic drift (Price et al. 2014), maximum body size in the fossil record (Payne et al. 2008), range shifts (Ettinger et al. 2011), and urban crop pollination (Waters and Clifford 2014).
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Checklist that can be used as a guide in analyzing the assignment examples
This book provides an introduction to the study of meaning in human language, from a linguistic perspective. It covers a fairly broad range of topics, including lexical semantics, compositional semantics, and pragmatics. The chapters are organized into six units: (1) Foundational concepts; (2) Word meanings; (3) Implicature (including indirect speech acts); (4) Compositional semantics; (5) Modals, conditionals, and causation; (6) Tense & aspect.
This activity will introduce pH testing of cleaning products, citrus fruits, and then analyzes a mystery Green product. Students will compare and contrast findings to discover an earth friendly product.
College-level adaptation of a chapter in the Earth Exploration Toolbook. Examine satellite images of atmospheric ozone in the Southern Hemisphere to study changes in concentration over a time.
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This online activity shows how to use FRED, the Federal Reserve's free online economic data website, to analyze changes in real gross domestic product (GDP) and GDP makeup over time. Following simple instructions, you will locate spending data for the individual components of real GDP, and then combine them into a highly informative area graph. You will also use FRED's ability to stack data and see how trade—imports and exports—contributes to GDP. The resulting customized graph will let you see how economic output varies from year to year.
Intermediate students are asked to analyze data on the components of consumption and investment expenditures and explanatory variables based on textbook models of each. Students look for rough correlations between the explanatory and dependent variables.
This lab activity has students rolling a marble down a ramp to study position, velocity, and acceleration. Based on a experiment performed by Galileo.
This unit is intended for students studying digital media production in the 10-12th grade. The purpose of the unit is to help students to learn from some of the positive uses and negative uses of media. In this unit students will study the use of media to manipulate people: propaganda, followed by the power of media to call people to action, and the potential for calls-to-action based on social and or digital media to have both positive and unintended negative consequences. The students will study media bias and some potential consequences of it. The students will then reflect on which types of societal consequences for posting their digital media would be unacceptable to them. Armed with this knowledge, they will create personal standards that will empower them as unaffiliated journalists to steer clear of undesired outcomes.
It is important for students to know how to evaluate messages conveyed by the news media. Exploration of the artistic techniques used in political cartoons leads to critical questioning.
These activities ask students to engage with the question of what an equitable school calendar looks like and how to make their own school calendar more inclusive.
Students explore and analyze the techniques that political (or editorial) cartoonists use and draw conclusions about why the cartoonists choose those techniques to communicate their messages.
This activity covers the causes, effects, and mitigation of urban heat in New York City. Students use data sets, graphs, maps and images to create their own plan for mitigation in their area. Robust satellite images, city data, tables, maps, and graphs are included in the resource for students to explore.
In this activity, students explore how the timing of color change and leaf drop of New England's deciduous trees is changing.
During a previous field trip to a local stream, students examine the stream and flood plain, evaluate evidence for high-discharge events, measure discharge, see the USGS gauging station for the stream and examine historical discharge records. Then, to prepare for hometown stream exercise, students chose a stream of personal interest to them and with at least 30 years of NWIS discharge data, and also gather personal knowledge and background information about their stream. The instructor uses Stony Brook data to model the project by downloading NWIS discharge data and using the data to a) describe the typical annual pattern of discharge, b) graphpeak annual discharge for the years of record, c) making a flood frequency graph and d) integrating background information into an analysis of the stream's discharge. Students then do this for their own streams. The activity involves students in accessing and analyzing real data, integrating background information into a technical analysis. They also gain experience with Microsoft Excel and via other students' work, learn about streams that can be quite different from their own.
(Note: this resource was added to OER Commons as part of a batch upload of over 2,200 records. If you notice an issue with the quality of the metadata, please let us know by using the 'report' button and we will flag it for consideration.)
Le diagnostic est défini comme l’ensemble des mesures réalisées afin d’identifier la nature et la cause des pathologies. Cette recherche est par essence imparfaite et tout thérapeute visera, autant que faire se peut, à s’approcher au plus près du diagnostic. Dans ce processus, plusieurs modalités (anamnèse, examen clinique et examens complémentaires) seront nécessaires tout en restant insuffisantes - ou pour le moins imprécises - lorsqu’elles seront considérées de manière isolée. Au final, c’est la synthèse de ces données qui nous offrira la meilleure vision d’une pathologie nécessairement spécifique et individuelle. La médecine se trouve à mi-distance entre les sciences exactes et les sciences humaines. Certains la définissent aussi comme un art, c’est-à-dire comme une capacité individuelle qu’aurait chaque médecin à soigner. En partie en réaction avec cette idée, depuis une trentaine d’années, l’Evidence Based Medicine s’est progressivement imposée dans les parcours thérapeutiques en même temps qu’une multitude de nouveaux examens complémentaires. Cette évolution vers davantage de science se voit aujourd’hui modérée par un retour progressif à une prise en charge plus globale des patients et c’est probablement à mi-chemin que se trouvera la meilleure stratégie. L’avantage de cette méthode est appuyé par la littérature scientifique actuelle qui montre, chaque jour un peu plus, l’interconnexion des différentes pathologies là-même où nous aurions pensé les séparer par une frontière bien nette. La prise en charge du patient dans sa globalité est garantie par un interrogatoire et un examen clinique bien conduits. Eux seuls peuvent efficacement orienter la nécessité d’examens complémentaires dont la précision extrême reste limitée soit dans l’espace (une IRM lombaire ne couvre que quelques vertèbres…) soit par leur technologie (faible résolution spatiale de la scintigraphie...). La pathologie rachidienne est décrite, à cause de sa prévalence, comme la pathologie du siècle. Elle constitue un des premiers motifs de consultation. Son impact est important sur le plan socio-économique et sur le plan de la santé publique. En effet, en termes d’invalidité, les problèmes lombaires sont au premier plan, suivis par la dépression et les autres affections musculo-squelettiques. Le vieillissement de nos populations s’accompagne d’une augmentation des pathologies dégénératives - y compris rachidiennes - associant des symptômes d’enraidissement, de douleur, de déformation ou de déficit neurologique. Dans ce chapitre, nous nous efforcerons de mettre en lumière les éléments fondamentaux à recueillir dans le cadre d’une consultation en pathologie rachidienne. Il ne s’agit donc pas d’une description exhaustive de l’ensemble des techniques d’interrogatoire et d’examen clinique mais plutôt d’un recueil d’étapes nécessaires pour pouvoir s’orienter correctement et parler un même langage.
This informational text explains that while both the Arctic and Antarctica are cold, Antarctica is much colder and drier - a polar desert. The text is written at a grades four through five reading level. This version is a full-color PDF that can be printed, cut and folded to form a book. Each book contains color photographs and illustrations.
This informational text explains that while both the Arctic and Antarctica are cold, Antarctica is much colder and drier - a polar desert. The text is written at a kindergarten through grade one reading level. This version is a full-color PDF that can be printed, cut and folded to form a book. Each book contains color photographs and illustrations.
This informational text explains that while both the Arctic and Antarctica are cold, Antarctica is much colder and drier - a polar desert. The text is written at a grade two through grade three reading level. This is a PDF containing the informational text and a glossary.