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ID:42181730
大小:204.51 KB
页数:9页
时间:2019-09-09
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1、primarybattery庄宗霖backgroundThefactthatchemicalactioncanproduceadirectcurrentofelectricitywasdiscoveredin1785.Thesimplestchemicalcellconsistsofastripofcopperandastripofzincimmersedinasolutionofsulfuricacid.Thechemicalactionoftheacidonthezinccausestheflowofelectricalcharges.Thecur
2、rentproducedistheresultofchemicalenergybeingchangedtoelectricalenergy.Whenthecopperandthezincplateareconnectedwithawire,theelectronsflowtothecopper.Thezincisthenegativeplate.Thecopperispositivewithrespecttothezinc.Thisisbecausethecopperhasalowerelectricpotentialthanzinc.Inthecha
3、ngefromzinctwoelectronsaregivenoff.Thezincionssurroundthezincplate,andtheelectronscollectonthecopperplateorflowthroughtheexternalcircuit.Zn→Zn2++2e-Hydrogenionsarealsopresentinthesolution.Theseexcesszincionsrepelthehydrogenions.Thehydrogenionsaredriventothecopperstripwheretheyco
4、llectelectronsandbecomehydrogenatoms.2H++2e-→H2↑Aprimarybatterywherechemicalenergyisconvertedintoelectricalenergyismadeupoftwoelectrodesimmersedinaelectrolyte.Inthesimplestprimarybatteryelectrolyteisasolutionofsulfuricacidinthewater.summaryTheflowofelectronsfromthezincplatetothe
5、copperplaterepresentselectricalenergy.Thisenergycomesfromthezincthathasbeendissolvedintheelectrolyte.Whenelectronsmovethroughawire,electricalenergyisavailable.Movingelectronscandowork.Theycanproduceheatandlightandcanmakemotorsrun.thankyou庄宗霖
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