PURPOSE: Show how a voltage divider can be used to produce any voltage up to the maximum of the source.
DESCRIPTION: The circuit below uses a 7.5 volt battery across the entire coil, with the variable voltage taken across the slider to ground (or negative terminal of the battery).
SUGGESTIONS: Disconnect battery when not in use.
REFERENCES: (PIRA unavailable.)
EQUIPMENT: 7.5 volt battery, variable resistor, and lecture meter.
SETUP TIME: 5 min.
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