Teaching-Learning Sequences Using Low-Cost Experiments Aimed at Understanding of Concepts of Electricity

Author(s):  
Věra Koudelková ◽  
Leoš Dvořák
2020 ◽  
Vol 42 ◽  
pp. e1
Author(s):  
Cristiano Rocha da Cunha ◽  
Lúcio Ângelo Vidal ◽  
Guilherme Tales da Silva ◽  
Ruth Silva Pereira ◽  
Rita Santana Ramos Silva ◽  
...  

Knowing the g-value of acceleration of gravity is of paramount importance in various analyzes, and there are several ways of obtaining it experimentally. Here, searching for resources that are easy to apply in high school classrooms, the authors opted for the observation of a simple pendulum, performing a series of measurements of the pendulum period and applying them to the equations (appropriately manipulated for this experiment) of this oscillatory movement. The experiment was carried out in four steps: one with a mass of 10 grams and three with a mass of 20 grams; two with ten swings, one with fifteen and one with twenty. As a result, four values of local acceleration were estimated,which were compared, using the theory of errors, with the value made available in the literature. With these data, the feasibility of using this device in the teaching-learning process was verified, given its ease of handling and assembly, its low cost and its negligible error with the value of the literature.


Author(s):  
Armando Gómez-Vieyra ◽  
Ismael Gabriel Cosme-Cisneros ◽  
José Raúl Miranda-Tello ◽  
Sonia Hernández-Mota

In the teaching-learning process at the upper and upper secondary levels, it is difficult to motivate students about the importance of knowing and applying basic concepts in industrial processes. Therefore, it is proposed how to apply the concept of light polarization and spectroscopy to visualize the differences between substances based on sucrose or fructose. Both techniques have been applied in various industrial processes; their cost is regularly high and require extensive training. In this paper, we present the results of the implementation of a low cost linear polariscope for the analysis of natural bee honey and syrups based on sucrose. The arrangement consists of a semiconductor laser, a photodiode, two polarizers, a stepper motor and some mechanical elements, all controlled by the computer through a graphical interface. To validate the results, an optical array based on a low-cost commercial spectroscope is used. By implementing this experimental arrangement, the concepts of polarization, optical activity, atomic-molecular physics, electronic instrumentation and principles of equipment design and construction are involved.


Author(s):  
Alejandro Bonnet de León ◽  
Jose Luis Saorín ◽  
Jorge De la Torre-Cantero ◽  
Cecile Meier ◽  
Eliseo García Marrero

In some classrooms the use of digital tablets for students is already standardized and is integrated into the teaching-learning process of the school. On the other hand, the use of cutting plotters is not common, although they are low-cost, easy to use and transportable devices. These machines are usually found in digital fab-rication spaces such as Makerspaces, Fab labs, etc. However, it is interesting to introduce these technologies in traditional classrooms. This article describes an experience carried out at Colegio San Isidro, Los Salesianos de la Orotava, Tene-rife in the 3rd year of secondary school in the subject of plastic, visual and audio-visual expression, in which an activity of design and creation of pop-up cards has been carried out. This activity is made in many subjects in order to develop crea-tivity or to understand three-dimensional concepts (mathematics, plastic, etc.). This activity involves cutting and folding paper that is usually done with scissors or cutter. It is proposed to digitalize this activity by means of digital tablets and portable cutting plotters. At the end of the activity, all the students were able to make their pop-up card using the proposed technologies and felt able to carry out the work autonomously.


2014 ◽  
Vol 116 ◽  
pp. 4199-4204
Author(s):  
Corina González-Weil ◽  
Cristian Merino-Rubilar ◽  
Germán Ahumada ◽  
Andoni Arenas ◽  
Victor Salinas ◽  
...  

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