electricity.jpg (5852 bytes)

CONSTRUCTION OF A VOLTAIC CELL

(This demonstration has not been done in a LONG, LONG time.)


EQUIPMENT
    redball.gif (326 bytes) Sulfuric Acid
    redball.gif (326 bytes) Zinc rod or plate
    redball.gif (326 bytes) Copper plate
    redball.gif (326 bytes) Large Demonstration Meter
    redball.gif (326 bytes) Paper Towels



NARRATIVE
            The Voltaic cell consists of a zinc rod or plate and a copper plate immersed in a 5% solution of sulfuric acid. An ammeter with a 1 amp shunt shows current in the circuit. After a few seconds of immersion of the zinc rod, current ceases because hydrogen combines with the surface of the zinc forming an insulator. Wipe this coating away while still moist with a paper towel.