This Ohm's Law Apparatus is used to demonstrate the interdependence of current, voltage and resistance.Fully labelled with circuit diagram.Great for a school science classroom.Includes AC/DC adapter. The Ohm's Law Apparatus could also be powered by a 6V Battery - the correct polarity must be followed.This apparatus features a DC voltmeter, DC ammeter and a low wattage built-in rheostat.Dimensions: (L)203mm x (W)172mm x (H)64mm