Risultati della ricerca
Anno XXXVIII - n.3 - luglio/settembre 2005 La macchina di Stirling
The construction and working of a simple Stirling motor are reported and its thermodynamic behaviour and yield are analysed. This kind of heat engine is remarkably simple and attractive, owing to its unique property of extracting work from heat sources with differential temperatures as low as 20°C. […]
Anno XXXVIII - n.3 - luglio/settembre 2005 Studio sperimentale di una cella fotovoltaica
An experimental investigation on the electro-optical behavior of a photodiode was carried out using an RTL acquisition system with current and voltage probes. Information is given on the theoretical background and the results of measurements aimed at identifying the conditions of maximum photovoltaic efficiency are reported. […]
Anno XXXVIII - n.3 - luglio/settembre 2005 Analisi del vento rilevato da una centralina meteo
The students of a vocational school installed a meteorological station and measured and studied the pattern of the winds. The activity proved to be a valid didactic experience with a scientific fallout because these were the first known data about the wind in the surroundings. […]
Anno XXXVIII - n.2 - aprile/giugno 2005 La Fisica: scienza e linguaggio
An analysis of the character and structure of the physical description of the world starts by discussing a simple case of measurement in geometry. In the relationship between linear dimensions and surface extent of similar plane figures one can distinguish (i) a general part that does not depend on the particular figure and (ii) a numerical parameter that depends on the figure and on the linear element that is being considered. […]
Anno XXXVIII - n.2 - aprile/giugno 2005 Che può fare un professore come te o un alunno come il tuo con un libro di testo come questo? Suggerimenti di attività poco convenzionali
Unconventional activities and tasks based on writings found in science textbooks are suggested to teachers and students. The aim of the activities is to foster critical awareness in appraising information and learning from one’s own learning. […]
Anno XXXVIII - n.2 - aprile/giugno 2005 Modello d’occhio che accomoda
In a model for demonstrating the function of an eye, a plastic sphere filled with water represents the ocular globe. Inside the sphere, a liquid lens is arranged in the path of a beam of light between a circular window serving as cornea and a semitransparent surface on the opposite side serving as substitute retina. […]
Anno XXXVIII - n.2 - aprile/giugno 2005 Dalla luce di una lampadina la determinazione della costante di Planck
A simple low cost autonomous apparatus for measuring Planck’s constant is described. Although the precision is not high, the experiment shows how the quantization of radiant energy is deduced from the properties of a black body, in a way very close to the history of Planck’s discovery. […]