Wheatstone Bridge (5F20.40)
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Measure resistance by balancing voltage drops over two different paths, one of which includes the resistor to be measured. Three types are available: (1) With Lamps to show the principle but not make actual measurements, (2) With a sliding wire to make actual measurements, and (3) A commercial bridge as a show-and-tell item.
110 Volts AC is connected to the two green terminals on the left and right sides of the circuit board.
Adjust the potentiometer until the middle light bulb is not glowing at all.
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Potentiometer Resistance is too low.
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Potentiometer Resistance is too high.
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Potentiometer Resistance is correct.