Counting Electrical Charges in Motion (1961)

The film explains the measurement of electric current using ammeters, which quantify the flow of elementary charges in a circuit. It introduces the concept of amperes as a measure of the number of charges passing through a point per second, with one ampere equating to 6.25 x 10^18 elementary charges. Through an electrolysis experiment, the film demonstrates how to calibrate an ammeter by counting the number of hydrogen atoms produced, which correlates directly to the flow of charges. Additionally, it discusses the use of sensitive equipment to measure very small currents and illustrates the randomness of charge flow in electric circuits.

Keywords
electric current, ammeter, elementary charges, amperes, electrolysis, calibration, hydrogen atoms, sensitive equipment, charge flow

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