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January 01, 1990Variable resistorsThe physics of components that do not have a constant resistance including the NTC thermistor13 minPlay
January 01, 1990Using potential dividersA demonstration of how potential dividers can be used in a volume control and in a balance control9 minPlay
January 01, 1990EMF and internal resistanceAn introduction to resistivity as a property of materials and its relationship with the resistance of components11 minPlay
January 01, 1990mains voltageHow to use an oscilloscope to measure the frequency of the mains voltage6 minPlay