Ohm’s Law Demonstrator Lampboard Rheostat. Learning the basics of electricity doesn’t get much more basic than this. Experiment with series and parallel circuits by studying the brightness and intensity of light bulbs. Clear plastic base mounted with 5 lamp receptables, 5 sets of binding posts. Includes instructions. You need 3.7V DC clear bulbs and 6V lantern battery, not included. 
 
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