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Mungan, Carl E.; Lipscombe, Trevor C. – European Journal of Physics, 2012
The ancient Babylonians had an iterative technique for numerically approximating the values of square roots. Their method can be physically implemented using series and parallel resistor networks. A recursive formula for the equivalent resistance R[subscript eq] is developed and converted into a nonrecursive solution for circuits using…
Descriptors: Physics, Science Instruction, Electronics, Networks
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Fukuhara, Akiko; Kaneko, Fumitoshi; Ogawa, Naohisa – European Journal of Physics, 2012
We introduce the photoacoustic educational system (PAES), by which we can identify which gas causes the greenhouse effect in a classroom (Kaneko "et al" 2010 "J. Chem. Educ." 87 202-4). PAES is an experimental system in which a pulse of infrared (IR) is absorbed into gas as internal energy, an oscillation of pressure (sound) appears, and then we…
Descriptors: Energy, Heat, Climate, Acoustics