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Rheostat, Potentiometer

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Inexpensive wire-wound variable resistances of various power ratings housed in ventilated black plastic cases which protect windings.  Resistance and power values are marked on the case.  Features three insulated binding posts so that students may use it as a potentiometer or rheostat. #1810-A  Rheostat, Potentiometer. . .25 Ohms. . .25 Watts #1810-B  Rheostat, Potentiometer. . .10 Ohms. . .25 Watts #1810-C  Rheostat, Potentiometer. . .500 Ohms. . .50 Watts #1810-D  Rheostat, Potentiometer. . .35 Ohms. . .50 Watts.