Apparatus by foster c 1875-1914


Apparatus for demonstrating the generation of heat in a conducting wire. It is nowhere near accurate enough to make quantitative measurements, but is sufficient to illustrate the rule that the heat generated in the wire is proportional to the resistance and the square of the current. The heat that is generated is measured by the expansion of the air in the spheres surrounding the resistance wires. This expansion is demonstrated by changes in the water level in the u-tubes. 32 cm high

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